He gets what's left: in general, he'll get a hotchpotch (7)
I believe the answer is:
legatee
'he gets what's left' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'general he'll get a hotchpotch' is the wordplay.
I cannot really understand how this works, but
'a' is within the answer.
an anagram of 'get' is 'egt' which is located in the left over letters.
'general' could be 'lee' (Robert E. Lee - US revolutionary commander) and 'lee' is found within the leftover letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for legatee that I've seen before include "one remembered" , "man newly-enriched?" , "One benefiting from a will" , "One receiving a bequest" , "Beneficiary of a will" .)