Musical instrument played by Paul McCartney and Brian Wilson (4,6)

I believe the answer is:

bass guitar

(Other definitions for bass guitar that I've seen before include "Low pitched, electrically amplified stringed instrument" , "(Usually) 4-stringed instrument" , "Low pitched, electrically amplified six-stringed instrument" , "Musical instrument" , "Electric instrument" .)

I've seen this clue in The Independent.

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