Saving a pound on fine carpet (6)
I believe the answer is:
frugal
'saving' is the definition.
(saving money)
'a pound on fine carpet' is the wordplay.
'pound' becomes 'l'.
'on' means one lot of letters go next to another.
'fine' becomes 'f' (abbreviation).
'carpet' becomes 'rug' (synonyms).
'a'+'l'='al'
'f'+'rug'='frug'
'al' put after 'frug' is 'FRUGAL'.
(Other definitions for frugal that I've seen before include "Sparing, meagre" , "Taking care" , "Thrifty - meagre" , "Tight" , "'Thrifty, avoiding waste (6)'" .)