Chatters away but sounds insecure (7)
I believe the answer is:
rattles
'chatters' is the definition.
The definition and answer can be both to do with perception as well as being verbs in their -s form.
Maybe you can see an association between them that I can't see?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for rattles that I've seen before include "Noisy toys for babies" , "Starlet (anag)" .)