Plaster for an eyesore? (4)
I believe the answer is:
daub
This clue is a double definition.
'plaster' is the first definition.
('daub' can be a synonym of 'plaster')
'an eyesore?' is the second definition.
(thesaurus)
'for' is the link.
(Other definitions for daub that I've seen before include "Carelessly spread (paint)" , "Smear; bad painting" , "Smear roughly or paint clumsily" , "Crude painting" , "Amateurish painting" .)