Crossword Genius

Polite fellow has arrived ahead of schedule, I hear (8)

Ross

I believe the answer is:

mannerly

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

'polite' is the definition.
(similar in meaning)

'fellow has arrived ahead of schedule i hear' is the wordplay.
I cannot quite understand how this works, but
'fellow' could be 'man' (fellow can mean a man) and 'man' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for mannerly that I've seen before include "Well-behaved" , "Polite, socially correct" .)

I've seen this clue in The Irish Times.
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