He supplies people with the latest information (9)
I believe the answer is:
newsagent
'he' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'people with the latest information' is the wordplay.
'people' becomes 'agent' (I am not sure about this - if you are sure you should believe this answer much more).
'with' is a charade indicator (letters next to each other).
'the latest information' becomes 'news' (I've seen this before).
'agent' put after 'news' is 'NEWSAGENT'.
'supplies' acts as a link.
Can you help me to learn more?
(Other definitions for newsagent that I've seen before include "daily shop" , "place selling organs?" , "Shopkeeper selling magazines" , "Seller of papers" , "Guardian seller?" .)