Crossword Genius

Eccentric, if excellent corporation (8)

Ross

I believe the answer is:

crackpot

'eccentric' is the definition.
(crackpot is a kind of eccentric)

'excellent corporation' is the wordplay.
'excellent' becomes 'crack' (the most excellent, as in a 'crack team').
'corporation' becomes 'pot' (corporation can humorously mean a pot belly).
'crack'+'pot'='CRACKPOT'

'if' acts as a link.

(Other definitions for crackpot that I've seen before include "Mad" , "Idiot" , "Ludicrous" , "Nutty" , "crazy type" .)

I've seen this clue in The Times.
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