Grease spilt over cheese cloth (7)
I believe the answer is:
taffeta
'cloth' is the definition.
(taffeta is a kind of cloth)
'grease spilt over cheese' is the wordplay.
'grease' becomes 'fat'.
'spilt over' is a reversal indicator.
'cheese' becomes 'feta' (I've seen this before).
'fat' in reverse letter order is 'taf'.
'taf'+'feta'='TAFFETA'
(Other definitions for taffeta that I've seen before include "Shiny silk fabric" , "fine stuff indeed!" , "fine material for dressing" , "Sheeny fabric" , "Stiff shiny material" .)