Curate and him somehow united in pain (9)
I believe the answer is:
rheumatic
'curate and him somehow united in pain' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'curate and him somehow' is the wordplay.
'and' is a charade indicator (letters next to each other).
'somehow' indicates anagramming the letters.
'curate' after 'him' is 'himcurate'.
'himcurate' with letters rearranged gives 'RHEUMATIC'.
Can you help me to learn more?
(Other definitions for rheumatic that I've seen before include "Affected by an inflammatory disease" , "Painfully stiff" , "Creaking sounds" , "suffering from disorder" , "Suffering from join and muscle pain" .)