Lifted plump cheese to find crisp material (7)
I believe the answer is:
taffeta
'crisp material' is the definition.
(type of crisp silk)
'lifted plump cheese' is the wordplay.
'lifted' shows that the letters should be reversed in order (going up in down clue).
'plump' becomes 'fat' ('fat' can be a synonym of 'plump').
'cheese' becomes 'feta' (I've seen this before).
'fat' back-to-front is 'taf'.
'taf'+'feta'='TAFFETA'
'to find' acts as a link.
(Other definitions for taffeta that I've seen before include "fine stuff indeed!" , "stuff made for dressing" , "Fabric -- a fat eft (anag)" , "Stiff, silky fabric" , "Fine crisp silk fabric" .)