Caught in final leg, rowed briskly (7)
I believe the answer is:
allegro
'briskly' is the definition.
(thesaurus)
'caught in final leg rowed' is the wordplay.
'caught in' says the answer is hidden in the clue.
'ALLEGRO' is hidden in the letters of 'final leg rowed'.
(Other definitions for allegro that I've seen before include "At a brisk speed (music)" , "Austin" , "Old car" , "Musically fast and lively - legal or what?" , "Instruction to perform in lively fashion" .)