Crossword Genius

To fool a fellow, you must have credibility (8)

Ross

I believe the answer is:

convince

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

'you must have credibility' is the definition.
I can't judge whether this definition defines the answer.

'to fool a fellow' is the wordplay.
'to fool' becomes 'con' (I've seen this in another clue).
'a fellow' becomes 'Vince' (man's name).
'con'+'vince'='CONVINCE'

Can you help me to learn more?

(Other definitions for convince that I've seen before include "Make believe" , "Satisfy as to truth" , "Satisfy by evidence" , "Persuade, satisfy" , "Persuade someone of the truth of something" .)

I've seen this clue in the Evening Standard.
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