Solution

HEIGHTENING

3 clues

Increasing

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

Other solutions to Increasing

Intensifying

Word class: Verb
Nature of clue: Synonym
Difficulty: Easy

Other solutions to Intensifying

Raising

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

Other solutions to Raising

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