Crossword Genius

Make more intense (8)

Ross

I believe the answer is:

heighten

'make more intense' is the definition.
(heightening is a kind of making more intense)

This is the entire clue.

(Other definitions for heighten that I've seen before include "Lift" , "Make more intense - elevate?" , "effect some improvement" , "Make more intense, say awareness" , "Become more intense" .)

I've seen this clue in The Times and The Mirror.
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