Consummate non-consumer consumed by contents of query (5)
I believe the answer is:
utter
'consummate' is the definition.
(I know that consummate can be written as utter)
'non-consumer consumed by contents of query' is the wordplay.
'non-consumer' becomes 'TT' (short for teetotaller, non-consumer of alcohol).
'consumed by' means one lot of letters goes inside another (inserted letters get consumed).
'contents of' says to take the centre (the letters on the inside of the word).
The central letters of 'query' are 'uer'.
'tt' put within 'uer' is 'UTTER'.
(Other definitions for utter that I've seen before include "Absolutely" , "talk" , "Prize" , "Make sounds (but not necessarily words)" , "issue" .)