Left expert to make fine fabric (4)
I believe the answer is:
lace
'fine fabric' is the definition.
(I've seen this before)
'left expert' is the wordplay.
'left' becomes 'l' (common abbreviation).
'expert' becomes 'ace' (ace is a kind of expert).
'l'+'ace'='LACE'
'to make' is the link.
(Other definitions for lace that I've seen before include "Shoe string" , "Famous play ''Arsenic and Old . . . .''" , "Spike - ornamental fabric" , "A fabric; add alcohol to" , "Tear" .)