Bigger and better shredder, they say (7)
I believe the answer is:
greater
'bigger' is the definition.
('great' can be a synonym of 'big')
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for greater that I've seen before include "more powerful" , "Less small" , "more imposing scale" , "Bigger, larger" , "More extensive" .)