Where these words are, framing dictionary's front cover (7)
I believe the answer is:
include
'cover' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
(Other definitions for include that I've seen before include "get involved" , "Throw in" , "Nuclide (anag.)" , "Take in as part of unit" , "Consider as part of something" .)