Fabric left with expert (4)
I believe the answer is:
lace
'fabric' is the definition.
(lace is a kind of fabric)
'left with expert' is the wordplay.
'left' becomes 'l' (common abbreviation).
'with' means one lot of letters go next to another.
'expert' becomes 'ace' (ace is a kind of expert).
'l'+'ace'='LACE'
(Other definitions for lace that I've seen before include "Delicate material" , "Shoestring: delicate ornamental fabric" , "Do up (shoe, etc)" , "Fine needlework" , "Spike - ornamental fabric" .)