Celebration, carnival (6)
I believe the answer is:
fiesta
I believe this clue is a double definition.
'celebration' is the first definition.
(fiesta is a kind of celebration)
'carnival' is the second definition.
(I've seen this before)
(Other definitions for fiesta that I've seen before include "Feast day" , "Continental knees-up" , "Religious event" , "(Spanish) religious festival" , "Religious festival in Spain" .)