Curate and him somehow united in some pain (9)
I believe the answer is:
rheumatic
'curate and him somehow united in some 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' says to put letters next to each other.
'somehow' is an anagram indicator.
'curate'+'him'='curatehim'
'curatehim' with letters rearranged gives 'RHEUMATIC'.
Can you help me to learn more?
(Other definitions for rheumatic that I've seen before include "inflammatory complaint" , "Like some painful muscles and joints" , "of specific aches" , "Like much joint pain" , "Type of muscle or joint pain" .)