Some local on guitar in accompaniment (5)
I believe the answer is:
along
'in accompaniment' is the definition.
(synonyms)
'some local on guitar' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'ALONG' is hidden within 'local on guitar'.
(Other definitions for along that I've seen before include "Lengthwise" , "By the side of" , "Moving in a constant direction on (something)" , "Throughout; onward" , "Sea monster, opposite Charybdis" .)