Try crazy flips (4)
I believe the answer is:
stab
'try' is the definition.
(I know that stab is a type of try)
'crazy flips' is the wordplay.
'crazy' becomes 'bats' (bats can informally mean crazy).
'flips' says the letters should be written in reverse.
'bats' reversed gives 'STAB'.
(Other definitions for stab that I've seen before include "Wound with pointed weapon" , "Thrust at and pierce" , "Rough guess; to knife" , "Try - skewer" , "Puncture" .)