Go bananas, having been stood up (4)
I believe the answer is:
stab
'go' is the definition.
(both can mean an attempt)
'bananas having been stood up' is the wordplay.
'bananas' becomes 'bats' (I've seen this before).
'having been stood up' says the letters should be written backwards (in a down clue, letters go up).
'bats' backwards is 'STAB'.
(Other definitions for stab that I've seen before include "Pierce with pointed weapon" , "Sudden sharp feeling" , "Jab" , "Rough guess; to knife" , "Impale; attempt" .)