Quarrelling, possibly raging about an upstart (7)
I believe the answer is:
arguing
'quarrelling' is the definition.
The definition and answer can be both to do with communicating as well as being present participle verbs.
Perhaps there's an association between them I don't understand?
'possibly raging about an upstart' is the wordplay.
'possibly' indicates an anagram.
'about' is an insertion indicator.
'an upstart' becomes 'u' (start of the word 'up').
'raging' anagrammed gives 'arging'.
'arging' going around 'u' is 'ARGUING'.
Can you help me to learn more?
(Other definitions for arguing that I've seen before include "Contending, disputing" , "Debating - disputing" , "in contention" .)