Crossword Genius

Repealed demand to purchase gun (7)

Ross

I believe the answer is:

negated

'repealed' is the definition.

'demand to purchase gun' is the wordplay.
'demand' becomes 'need' ('need' can be a synonym of 'demand').
'to purchase' indicates putting letters inside.
'gun' becomes 'gat' (gat is a kind of gun).
'need' going around 'gat' is 'NEGATED'.

(Other definitions for negated that I've seen before include "Contradicted" , "Made ineffective" , "Abrogated" , "Cancelled or destroyed the effect of something" , "Nullified" .)

I've seen this clue in The Telegraph.
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