Cowes Week, for instance (7)
I believe the answer is:
regatta
'cowes week for instance' is the definition.
(I know that Cowes Week is a regatta)
This is all the clue.
(Other definitions for regatta that I've seen before include "Boat race meeting" , "Yachting gala" , "Display of boats" , "event at the seaside" , "set of marine races?" .)