Crossword Genius

Exert oneself to the utmost (4,4,9)

Ross

I believe the answer is:

bend over backwards

(Other definitions for bend over backwards that I've seen before include "Try one's hardest" , "Make a special effort" , "Make great efforts" , "Make every effort (to please)" , "be a contortionist" .)

I've seen this clue in the Sydney Morning Herald.
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