Stressed about a lock (5)

I believe the answer is:

tress

'a lock' is the definition.
(thesaurus)

'stressed about' is the wordplay.
'about' says the answer is hidden in the clue.
'TRESS' is hidden in the letters of 'stressed'.

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

I've seen this clue in The Mirror and The Daily Express.

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