Recommending the finish, or warble (9)

I believe the answer is:

endorsing

I'm a little stuck... Click here to teach me more about this clue!

'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".)

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app