Crossword Genius

It's synonymous, primarily, with "to crush" (6)

Ross

I believe the answer is:

squash

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'crush' is the definition.
('squash' can be a synonym of 'crush')

I cannot understand how the rest of the clue works.

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(Other definitions for squash that I've seen before include "juice that's been watered down" , "Press the veg flat on court" , "Soft drink" , "Racket and ball game and a fruit" , "Vegetable on court?" .)

I've seen this clue in The Independent.
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