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 quite understand how this works, but
'a' is present in the answer.
an anagram of 'get' is 'egt' which is within the remaining 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 explanation may well be incorrect...
'in' is the 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" .)