Crossword Genius

Stone set in ring farthest from centre (6)

Ross

I believe the answer is:

distal

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

'farthest from centre' is the definition.
I can't judge whether this defines the answer.

'stone set in ring' is the wordplay.
'stone' becomes 'st' (abbreviation).
'set in' indicates putting letters inside.
'ring' becomes 'dial' (as in dialling a phone).
'st' inserted into 'dial' is 'DISTAL'.

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I've seen this clue in The Times.
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