Don't allow fraudulent vote! (4)

I believe the answer is:

veto

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

'don't allow' is the definition.
(I've seen this before)

'fraudulent vote' is the wordplay.
'vote' can be anagrammed to 'VETO'.
But, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for veto that I've seen before include "Refuse permission" , "Authoritative prohibition" , "Right to ban" , "Right to reject a proposed measure" , "Throw out" .)

I've seen this clue in The Guardian.

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