Handle issue in characteristic style (11)
I believe the answer is:
fingerprint
'handle issue' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'in characteristic style' is the wordplay.
I cannot quite see how this works, but
'in' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for fingerprint that I've seen before include "means of identification" , "Dab" , "Mark left by handler" .)