Found fault with new red cap (6)
'found fault' is the definition.
The definition and answer can be both to do with communicating as well as being past participle verbs.
Perhaps you can see an association between them that I don't see?
'new red cap' is the wordplay.
'new' indicates anagramming the letters.
'redcap' anagrammed gives 'CARPED'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for carped that I've seen before include "Complained like goldfish?", "Raised petty objections like goldfish", "Raised trivial objections".)