Carnival site wrecked in outskirts of Fuengirola (6)
I believe the answer is:
fiesta
'carnival' is the definition.
(thesaurus)
'site wrecked in outskirts of fuengirola' is the wordplay.
'wrecked' indicates anagramming the letters.
'in' means one lot of letters goes inside another.
'outskirts of' suggests removing the centre.
'fuengirola' with its centre taken out is 'fa'.
'site' anagrammed gives 'iest'.
'iest' placed into 'fa' is 'FIESTA'.
(Other definitions for fiesta that I've seen before include "Public celebration in Spain" , "Religious event" , "Elaborate public party, in Spain perhaps" , "Spanish party" , "religious celebration" .)