Crossword Genius

Large gamble? That's highly unlikely (3,6)

Ross

I believe the answer is:

fat chance

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

'highly unlikely' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'large gamble?' is the wordplay.
'large' becomes 'fat' (I've seen this in other clues).
'gamble?' becomes 'chance' (synonyms).
'fat'+'chance'='FAT CHANCE'

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for fat chance that I've seen before include "that won't happen" , "It will never happen!" , "Little prospect" , "No likelihood at all!" , "Slender hope (odd though that sounds)" .)

I've seen this clue in The Telegraph.
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