Success in rowing (3)
I believe the answer is:
win
'success' is the definition.
(thesaurus)
'in rowing' is the wordplay.
'in' says the answer is hidden in the clue.
'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" .)