Prove setter perhaps can be best in class, eventually (4,3)
I believe the answer is:
show dog
'be best in class eventually' is the definition.
(a show dog might win 'best in show')
'prove setter perhaps' is the wordplay.
'prove' becomes 'show' (synonyms).
'setter perhaps' becomes 'dog' (setter is a type of dog).
'show'+'dog'='SHOW DOG'
'can' is the link.
I've seen this clue in The Guardian.
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