Nun's headdress in former times (6)
I believe the answer is:
wimple
'nun's headdress in former times' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for wimple that I've seen before include "Nun's headress" , "Amazon country" , "Nun's headdress in former times" , "A bit of a habit?" , "Nun's veil" .)