Crossword Genius

Waver, vary (9)

Ross

I believe the answer is:

fluctuate

I believe this is a double definition.

'waver' is the first definition.
(I know that waver can be written as fluctuate)

'vary' is the second definition.
(I've seen this before)

(Other definitions for fluctuate that I've seen before include "Vary irregularly, rise and fall" , "Waver, go this way and that" .)

I've seen this clue in The Mirror.
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