Tense, like a guitar neck? (7)

I believe the answer is:

fretful

This clue is a double definition.

'tense' is the first definition.

'like a guitar neck?' is the second definition.
(the frets are the ridges on the fingerboard)

(Other definitions for fretful that I've seen before include "Distressed" , "Unsettled, irritated" , "Anxious" , "Peevish" , "on edge" .)

I've seen this clue in The Everyman puzzle in The Observer.

Want a hint initially instead of a full solution? Install my app