Cancel out (7)
'cancel out' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for nullify that I've seen before include "Declare invalid" , "Make invalid" , "Render void" , "Render ineffective" , "Bring to naught" .)
'cancel out' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for negate that I've seen before include "Disprove or nullify" , "Age ten (anag)" , "Make invalid" , "disallow!" , "Show to be false" .)