Go back in cab at seven (4)
I believe the answer is:
stab
'go' is the definition.
(both can mean an attempt)
'back in cab at seven' is the wordplay.
'back' shows that the letters should be reversed in order.
'in' says the answer is hidden in the clue.
'bats' is hidden within 'cab at seven'.
'bats' reversed gives 'STAB'.
(Other definitions for stab that I've seen before include "Attack with a knife" , "Wound with a dagger" , "shot in the dark?" , "Pierce with pointed weapon" , "Knife thrust; attempt" .)