Crossword Genius

Manor man makes genuine impression (8)

Ross

I believe the answer is:

hallmark

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

'genuine impression' is the definition.
(I've seen this before)

'manor man' is the wordplay.
I cannot really understand how this works, but
'man' could be 'mark' and 'mark' is found within the answer.
The remaining letters 'hall' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'makes' acts as a link.

Can you help me to learn more?

(Other definitions for hallmark that I've seen before include "It indicates the standard of precious metals" , "Assay stamp" , "Standard sign for silver" , "Assay-stamp" , "Distinguishing characteristic - indicates standard of gold, silver etc." .)

I've seen this clue in The Sun.
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