VAT agenda tweaked benefit (9)

I believe the answer is:

advantage

I'm a little stuck... Click here to teach me more about this clue!

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

'vat agenda tweaked' is the wordplay.
'vat agenda' can be anagrammed to 'ADVANTAGE'.
Though, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for advantage that I've seen before include "Asset" , "Use" , "Upper hand, benefit" , "Benefit, profit" , "Superior or more favourable position" .)

I've seen this clue in The Sun.

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