Girl is leaving stores stocking fabric (5)
I believe the answer is:
lisle
'stocking fabric' is the definition.
(I've seen this in another clue)
'girl is leaving stores' is the wordplay.
'stores' indicates the answer is hidden within the clue.
'LISLE' is hidden within 'girl is leaving'.
(Other definitions for lisle that I've seen before include "Twisted yarn" , "Fine smooth cotton thread for stockings" , "Maker of hose" , "Strong twisted cotton thread for the strange Ellis" , "Strong tightly twisted cotton thread" .)