Plan for carpet (6)
I believe the answer is:
format
'plan' is the definition.
(thesaurus)
'for carpet' is the wordplay.
'carpet' becomes 'mat' (I've seen this before).
'for'+'mat'='FORMAT'
(Other definitions for format that I've seen before include "Size, style and shape, of books say" , "Style or arrangement of procedure" , "Shape and style as of book" , "magazine" , "General arrangement of a publication" .)