Worry forfeit is regularly ignored (4)

I believe the answer is:

fret

'worry' is the definition.
(fretting is a kind of worrying)

'forfeit is regularly ignored' is the wordplay.
'is regularly ignored' means one should take alternating letters.
The alternate letters of 'forfeit' are 'FRET'.

(Other definitions for fret that I've seen before include "Worry, brood" , "Wear; guitar ridge" , "Display anxiety" , "Harry - on the guitar" , "Chafe; worry" .)

I've seen this clue in The Times.

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