Part of guitar made from pine (4)
I believe the answer is:
fret
This clue is a double definition.
'part of guitar' is the first definition.
(I've seen this before)
'pine' is the second definition.
(thesaurus)
'made from' is the link.
(Other definitions for fret that I've seen before include "Rub - a bit of the guitar" , "Part of a Gibson, say" , "Worry; or the marking on a guitar" , "Mist coming in from the sea" , "Display anxiety" .)