Guitar feature (4)
I believe the answer is:
fret
'guitar feature' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for fret that I've seen before include "Part of a Gibson, say" , "Worry - pine" , "Mist coming in from the sea" , "Worry about doing woodwork?" , "Guitar ridge; be anxious" .)