What bridge player may do in proverb, ideally (7)
I believe the answer is:
overbid
'what bridge player may do' is the definition.
(I know that bridge player often perform the action overbid)
'in proverb ideally' is the wordplay.
'in' says the answer is hidden in the clue.
'OVERBID' is hidden within 'proverb ideally'.
(Other definitions for overbid that I've seen before include "offer too much" , "offered too much" , "Higher auction offer" , "Contractor's mistake" , "Make rash offer" .)