Chewed section in non-speaking role (3,4)
I believe the answer is:
bit part
'role' is the definition.
(bit part is a kind of role)
'chewed section in non-speaking' is the wordplay.
I cannot really understand how this works, but
'chewed' could be 'bit' and 'bit' is found within the answer.
'section' could be 'part' (synonyms) and 'part' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bit part that I've seen before include "Small acting role" , "cameo" , "Tiny or non-speaking role in play" , "Tiny or non-speaking dramatic role" , "'Small role in film or play (3,4)'" .)