Bug Paul McCartney vocally? (6)

I believe the answer is:

beetle

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'bug' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for beetle that I've seen before include "Hang over" , "Scarab, say?" , "Insect with four wings" , "8's (very small) friend" , "... after {STATE = COLORADO] which he'll do for Charlotte" .)

I've seen this clue in The Sun.

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