Peninsula comprising Spain and Portugal (6)
I believe the answer is:
iberia
'peninsula comprising spain and portugal' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for iberia that I've seen before include "Spain and Portugal (6)" , "European territory" , "European peninsula comprising Spain and Portugal" , "The peninsula incorporating Spain and Portugal" , "It comprises Spain and Portugal" .)