Recommending the finish, or warble (9)
I believe the answer is:
endorsing
'recommending' is the definition.
The answer and definition can be both to do with communicating as well as being present participle verbs.
Maybe they are linked in a way I don't understand?
'finish or warble' is the wordplay.
'finish' becomes 'end' (synonyms).
'warble' becomes 'sing' (I've seen this in another clue).
'end'+'or'+'sing'='ENDORSING'
'the' acts as a link.
Can you help me to learn more?
(Another definition for endorsing that I've seen is " backing".)