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When PM starts taking advice, finally, from nobody (4)

Ross

I believe the answer is:

noon

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

'when pm starts' is the definition.
(I've seen this before)

'taking advice finally from nobody' is the wordplay.
I cannot quite see how this works, but
'taking' could be 'on' (eg one taking drugs is 'on' drugs) and 'on' is located in the answer.
'from' could be 'o' (I've seen this in other clues) and 'o' is found in the answer.
A single letter 'n' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for noon that I've seen before include "when PM starts" , "Twelve during daylight" , "The middle of the day" , "12 pm" , "High time of day?" .)

I've seen this clue in The Telegraph.
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