Brigitte Bardot's very special hair (5)

I believe the answer is:

tress

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'hair' is the definition.
(I know that tress is a type of coif)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for tress that I've seen before include "Curl - lock" , "Rests (anag.)" , "Long lock or plait of hair" , "Bit of hair" , "Switch" .)

I've seen this clue in The Independent.

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