Sister's headdress (6)

I believe the answer is:

wimple

(Other definitions for wimple that I've seen before include "Woman's veil of old" , "Part of traditional nun's dress" , "Woman's old headdress, worn by some nuns now" , "Nun's veil" , "In the past, a headdress for some nuns" .)

I've seen this clue in The Telegraph.

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