Spread over Spain (5)
I believe the answer is:
paste
'spread' is the definition.
(synonyms)
'over spain' is the wordplay.
'over' becomes 'past' (I've seen this before).
'spain' becomes 'e' (abbreviation for Espana).
'past'+'e'='PASTE'
(Other definitions for paste that I've seen before include "Adhesive, for wallpaper say" , "Tapes (anag.)" , "It is used to stick wallpaper" , "Sticky stuff" , "Adhesive, doughy, or jewel-like substance" .)