Crossword Genius

Give aid to guitar player having missed intro (6)

Ross

I believe the answer is:

assist

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for assist that I've seen before include "provide backing" , "Give help" , "Pitch in" , "Pass to scorer" , "Work with N help" .)

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