Those in charge of viral image including a horse and cart ultimately (10)
I believe the answer is:
management
'those' is the definition.
I can't judge whether this definition defines the answer.
'charge of viral image including a horse and cart ultimately' is the wordplay.
'charge of viral image' becomes 'meme' (I can't justify this - if you can you should believe this answer much more).
'including' is an insertion indicator.
'horse' becomes 'nag' (term for an old horse).
'and' becomes 'n' (common abbreviation for 'and').
'ultimately' suggests the final letters.
The last letter of 'cart' is 't'.
'a'+'nag'='anag'
'meme' enclosing 'anag' is 'manageme'.
'manageme'+'n'+'t'='MANAGEMENT'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for management that I've seen before include "Top part of organisation" , "Organisation heads" , "Those running an organisation" , "Organisation's leaders" , "The bosses" .)