Crossword Genius

No current benefit concerning grandad? (4)

Ross

I believe the answer is:

aval

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for aval that I've seen is " Grandad".)

I've seen this clue in The Times and The Sunday Times.
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