Boat race (7)
I believe the answer is:
regatta
'boat race' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for regatta that I've seen before include "Number of yachts in sporting event" , "Sporting event with boat or yacht races" , "Sports event" , "Meeting at Dartmouth, perhaps" , "event at the seaside" .)