My consumption of gin, somehow, is not generous (5)
I believe the answer is:
mingy
'generous' is the definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I don't see?
'my consumption of gin somehow is not' is the wordplay.
I cannot quite see how this works, but
an anagram of 'gin' is 'ing' which is present in the answer.
'my' is within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for mingy that I've seen is " Tight-fisted".)