Flipping crazy attempt (4)
I believe the answer is:
stab
'attempt' is the definition.
(to have a stab is to attempt something)
'flipping crazy' is the wordplay.
'flipping' says the letters should be written in reverse.
'crazy' becomes 'bats' (bats can informally mean crazy).
'bats' backwards is 'STAB'.
(Other definitions for stab that I've seen before include "pink" , "Wound with blade" , "Twinge; guess" , "Jab" , "Thrust (weapon into)" .)