Old plucked instrument (8)
I believe the answer is:
psaltery
'old plucked instrument' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for psaltery that I've seen before include "Ancient zither-like instrument" , "something demanding pluck" , "string instrument of yore" , "Dulcimer-like instrument" , "Old plucked instrument" .)