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Bigger and better shredder, they say (7)

Ross

I believe the answer is:

greater

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'bigger' is the definition.
('great' can be a synonym of 'big')

I cannot understand how the remainder of the clue works.

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(Other definitions for greater that I've seen before include "more powerful" , "Less small" , "more imposing scale" , "Bigger, larger" , "More extensive" .)

I've seen this clue in The Irish Times.
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