Subtle variations one's not found in pests (7)
I believe the answer is:
nuances
'subtle variations' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Maybe there's an association between them I don't understand?
'one's not found in pests' is the wordplay.
I cannot quite see how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for nuances that I've seen before include "Subtle differences" , "Suspicion of" , "subtle shades" , "'Subtle variations, in meaning perhaps (7)'" , "Fine shades (of meaning)" .)