Success in rowing (3)
I believe the answer is:
win
'success' is the definition.
(I've seen this in another clue)
'in rowing' is the wordplay.
'in' indicates a hidden word.
'WIN' is hidden within 'rowing'.
(Other definitions for win that I've seen before include "Be victorious or succeed" , "Come out on top" , "Finish in first place" , "Come first" , "Succeed, conquer" .)