An individual who's not particular (7)
I believe the answer is:
anybody
This clue could be a double definition.
'an individual' is the first definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?
'not particular' is the second definition.
The definition suggests a singular noun which matches the answer.
'who's' is the link.
Can you help me to learn more?
(Other definitions for anybody that I've seen before include "Whichever person" , "Each of us" , "no-one in particular" , "An unspecified person" .)