Robotic, plain-sounding Trump gave boring speech (6,2)

I believe the answer is:

droned on

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

'robotic' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives can occasionally define each other.

'plain-sounding trump gave boring speech' is the wordplay.
I cannot quite understand how this works, but
'speech' could be 'drone' (drone is a kind of speech) and 'drone' is present in the answer.
The remaining letters 'don' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.