Band to keep stocking or sleeve up (6)
I believe the answer is:
garter
'band to keep stocking or sleeve up' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for garter that I've seen before include "Sock supporter" , "Band around the leg or arm" , "Band to keep a stocking or sleeve up" , "Band involved in hold-up" , "Stocking supporter" .)