Last year's grand finalists Clarence scored the opening goal in the first term before the rookies kicked the final three to win 3.2 (20) to 1.2 (8).

Coach Dean Smith was proud of his side keeping their rivals goalless in the last three terms, calling the six-point scores a "bit like gold".

"The conditions were pretty bad, but we talked about that at half-time," Smith said.

"We sort of had it in our forward 50 a fair bit and we just weren't capitalising.

"The second half we found it a bit harder to get into the forward line, but we also set ourselves a challenge of not letting it out so easily."

He said that conquering Clarence was one of resiliency in the club's ninth game.

The Bombers were goalless in the first half, but kicked two in the third and one in the last as the Roos scored one behind in the half.

"Last time we played these girls, we got the jump on them," Smith said.

"There was only one goal in it, even though they were playing the better footy."

A gritty Bonnie Fowler led the charge from the backline just after being cut from the under-18 state squad.

Maggie Cuthbertson was again dominant for the Bombers in the front half.

"I put the challenge back on them to have a bit of confidence in themselves," Smith said. "I said all the stuff that we put on at training we need to put into action."