Carnival; holiday (6)
I believe the answer is:
fiesta
I believe this clue is a double definition.
'carnival' is the first definition.
(I've seen this before)
'holiday' is the second definition.
(I've seen this before)
(Other definitions for fiesta that I've seen before include "Spanish party" , "Holiday; carnival" , "A Spanish public celebration" , "Festival, fete" , "Spanish holiday" .)