Gentlemanly opportunity has a reasonable prospect of success (8,6)

I believe the answer is:

sporting chance

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'a reasonable prospect of success' is the definition.
I can't tell whether this definition defines the answer.

'gentlemanly opportunity' is the wordplay.
'gentlemanly' becomes 'sporting' (I am not sure about this - if you are sure you should believe this answer much more).
'opportunity' becomes 'chance' (synonyms).
'sporting'+'chance'='SPORTING CHANCE'

'has' is the link.

Can you help me to learn more?

(Other definitions for sporting chance that I've seen before include "Likelihood" , "Reasonable hope of success" , "risk thats worth taking?" .)

I've seen this clue in The Daily Express.

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