We gather stupid insinuation is quietening (10)
I believe the answer is:
diminuendo
'quietening' is the definition.
Both the answer and definition are adjectives. Maybe there's a link between them I don't understand?
'we gather stupid insinuation' is the wordplay.
I cannot really see how this works, but
'gather' could be 'in' ('in' can mean to gather produce when farming) and 'in' is located in the answer.
'stupid' could be 'dim' (similar in meaning) and 'dim' is located in the answer.
This explanation may well be incorrect...
'is' acts as a link.
Can you help me to learn more?
(Other definitions for diminuendo that I've seen before include "becoming quieter" , "volume is to be cut" , "Getting quieter" , "Letting sound fade away" , "losing force" .)