Headdress worn by Sikh men (6)
I believe the answer is:
turban
'headdress worn by sikh men' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for turban that I've seen before include "Nut bar (anag.)" , "Religious head covering" , "it provides cover for head" , "Headdress worn by Sikh men" , "Indian headdress" .)