Decorate article that's boring too (7)
I believe the answer is:
overlay
'decorate' is the definition.
(thesaurus)
'article that's boring too' is the wordplay.
'article' becomes 'a' (the indefinite article in English).
'that's boring' indicates putting letters inside (some letters must 'bore' a hole into other letters).
'too' becomes 'overly' (synonyms).
'a' going within 'overly' is 'OVERLAY'.
(Other definitions for overlay that I've seen before include "Cover" , "Put on top of something else" , "put on coat" , "Lie on top of; covering" , "Blanket" .)