Solution

CANCELS

3 clues

Calls off

Word class: Verb
Nature of clue: Synonym
Difficulty: Very easy

Nullifies

Word class: Verb
Nature of clue: Synonym
Difficulty: Very easy

Other solutions to Nullifies

Voids

Word class: Verb
Nature of clue: Synonym
Difficulty: Very easy

Words are categorized by artificial intelligence: there can be mistakes.