Indisposed to take a bit of a gamble on a girl (6)
I believe the answer is:
'indisposed' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?
'take a bit of a gamble on a girl' is the wordplay.
I cannot quite see how this works, but
'take' could be 'nab' (I've seen this in another clue) and 'nab' is present in the answer.
The remaining letters 'ule' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'to' acts as a link.
Can you help me to learn more?
(Other definitions for unable that I've seen before include "Lacking the skill" , "Not capable" , "Not having sufficient power" , "Lacking power (to do something)" , "Incapable" .)