Crossword Genius

Ban, disallow (4)

Ross

I believe the answer is:

veto

I believe this is a double definition.

'ban' is the first definition.
(veto can mean a ban or prohibition on something)

'disallow' is the second definition.
(I know that disallow can be written as veto)

(Other definitions for veto that I've seen before include "Refuse permission" , "Embargo" , "Throw out" , "Ban; refuse to allow" , "Refuse to endorse" .)

I've seen this clue in The Telegraph.
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