Crossword Genius

Stony 'Mr' from Margate (5)

Ross

I believe the answer is:

agate

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'stony mr from margate' is the definition.
I can't judge whether this definition defines the answer.

'mr from margate' is the wordplay.
'from' is a deletion indicator.
'margate' with 'mr' removed is 'AGATE'.

Can you help me to learn more?

(Other definitions for agate that I've seen before include "Decorative stone" , "Quartz variety" , "Banded ornamental stone" , "Semi-precious stone" , "Impure form of quartz with banded chalcedony, used as a gemstone" .)

I've seen this clue in the Evening Standard.
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