Craig Newitt has been booked to ride the Chris Waller-trained Eckstein in the group 1 $500,000 Tatts Tiara at Eagle Farm on Saturday.

Eckstein was placed in a group 3 race at her last start and is rated a $15 chance by tab.com.au.

Newitt has been teaming up with Waller on a regular basis in Melbourne and scored another win at the weekend on Mawaany Machine at Sandown.

"He's a very good horse - he was bought from Europe for the major cups and he'll come back even better after a break," the jockey said.

Raquel Clark won another race in Singapore on Saturday, scoring on Acrobat for leading trainer Stephen Gray, a former Kiwi.

It wrapped up a successful trip for the former Devonport apprentice who won the $175,000 group 3 Silver Bowl the previous week.

Clark now heads back to Adelaide where she will be trying to seal the metropolitan senior jockeys' premiership.

Despite missing three meetings, she is still one ahead of Jamie Kah and five ahead of Todd Pannell.

Jason Maskiell has also been in winning form interstate.

The former Longford rider, now based in Victoria, has had winners at Wodonga and Pakenham over the past three days.

Tasmania's chief steward Scott Quill has moved to clarify a contentious decision involving Spreyton trainer Barry Campbell.

Campbell was disqualified by South Australian stewards last Friday but was allowed to race his horses at Spreyton on Sunday when he had three winners.

This led to complaints from some other trainers who have not been allowed to start their horses in similar circumstances.

However Quill said on Monday that the stewards were adhering to a decision made by the South Australian Racing Appeal Board.

He said that when Campbell lodged an appeal against his disqualification late on Friday, he applied for a stay of proceedings.

"The Appeal Board gave him an interim stay until midnight on Sunday which allowed him to start his horses at Sunday's meeting," Quill said.

"That interim stay has now expired so from today (Monday) he cannot nominate for any races.

"The situation will only change if he is granted a full stay."

That decision is expected in the next day or so.

Stewards have been continually warning jockeys to ride their mounts out to the finish and at Spreyton on Sunday they finally ran out of patience.

Chris Graham was fined $400 for not riding out Gee Gee Ladybird in the Benchmark 58 which stewards said cost the filly fourth place.