It's plucked or strummed (6)
I believe the answer is:
guitar
'it's plucked or strummed' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for guitar that I've seen before include "Popular stringed musical instrument" , "Fretted string instrument" , "Six-stringed instrument" , "Popular stringed instrument used by Beatles" , "Stringed instrument, may be electric" .)