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Anxiety, when cap is removed to reveal hair (5)

Ross

I believe the answer is:

tress

I'm a little stuck... Click here to teach me more about this clue!

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

I can't explain the rest of the clue.

Can you help me to learn more?

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

I've seen this clue in The Irish Times.
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