Device for making bits smaller or larger we hear (6)
I believe the answer is:
grater
'device for making bits smaller' is the definition.
I can't judge whether this defines the answer.
'larger we hear' is the wordplay.
'larger' becomes 'greater' ('great' can be a synonym of 'large').
'we hear' shows a homophone (sound like).
'greater' is a homophone of 'GRATER'.
'or' is the link.
Can you help me to learn more?
(Other definitions for grater that I've seen before include "Kitchen device" , "kitchen instrument" , "Kitchen utensil" , "Kitchen implement (for cheese, nutmeg, etc.)" , "Device used on cheese, nutmeg, etc" .)