Crossword Genius

Swindle hard to prove (7)

Ross

I believe the answer is:

confirm

'prove' is the definition.
(thesaurus)

'swindle hard' is the wordplay.
'swindle' becomes 'con' (synonyms).
'hard' becomes 'firm' (similar in meaning).
'con'+'firm'='CONFIRM'

'to' is the link.

(Other definitions for confirm that I've seen before include "Establish the truth of" , "Ratify; establish" , "Authenticate" , "Ratify or verify" , "Substantiate" .)

I've seen this clue in The Sun.
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