Crossword Genius

Make ineffective (7)

Ross

I believe the answer is:

nullify

'make ineffective' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for nullify that I've seen before include "Make of no effect" , "quash" , "Cancel, abolish" , "Declare invalid" , "Bring to naught" .)

I've seen this clue in the Sydney Morning Herald.
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