Crossword Genius

Mount set, doing without ring (7)

Ross

I believe the answer is:

gelding

'mount' is the definition.
(thesaurus)

'set doing without ring' is the wordplay.
'set' becomes 'gel' (both can mean to harden).
'without' is a deletion indicator.
'ring' becomes 'o' (letter resembling a ring).
'doing' with 'o' taken away is 'ding'.
'gel'+'ding'='GELDING'

(Another definition for gelding that I've seen is " Castrated male horse".)

I've seen this clue in The Times and The Sun.
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