Sound of more impressive kitchen utensil (6)
I believe the answer is:
grater
'kitchen utensil' is the definition.
(eg a cheese grater)
'sound of more impressive' is the wordplay.
'sound of' shows a homophone (sound like).
'more impressive' becomes 'greater'.
'greater' sounds like 'GRATER'.
(Other definitions for grater that I've seen before include "Kitchen implement (for cheese, nutmeg, etc.)" , "Utensil for reducing to small particles" , "Kitchen utensil" , "See 1" , "kitchen instrument" .)