Bidding millions, man admitted to hoax (7)
I believe the answer is:
command
'bidding' is the definition.
(synonyms)
'millions man admitted to hoax' is the wordplay.
'millions' becomes 'm' (abbreviation).
'admitted to' means one lot of letters goes inside another.
'hoax' becomes 'cod' (I've seen this before).
'm'+'man'='mman'
'mman' put within 'cod' is 'COMMAND'.
(Other definitions for command that I've seen before include "Authoritative order" , "Direct" , "Fiat" , "Order; dominate" , "Bidding" .)