Droop on carpet (6)
I believe the answer is:
wilton
'carpet' is the definition.
(I know that Wilton is a type of carpet)
'droop on' is the wordplay.
'droop' becomes 'wilt' (synonyms).
'wilt'+'on'='WILTON'
(Other definitions for wilton that I've seen before include "Type of woven carpet" , "Kind of English woven carpet" , "22 [WILTS] carpet business" , "Could be carpet" , "Woven carpet with a velvety pile" .)