Tidy in one attempt (4)
I believe the answer is:
'tidy' is the definition.
'in one attempt' is the wordplay.
'in' says the answer is hidden in the clue.
'NEAT' is hidden within 'one attempt'.
(Other definitions for neat that I've seen before include "without ice?" , "well-kept" , "As whisky may be" , "Finished" , "Bovine animal" .)