Crossword Genius

Find, when you amplify (4,2)

Ross

I believe the answer is:

turn up

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'find' is the definition.
(I know this)

I can't explain the rest of the clue.

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(Other definitions for turn up that I've seen before include "surprise" , "Appear by chance - increase volume" , "Increase strength" , "put in an appearance" , "make louder" .)

I've seen this clue in the Evening Standard.
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