Wrongly distribute millions before one's agreement (7)
I believe the answer is:
misdeal
'wrongly distribute' is the definition.
(to deal out in a bad way)
'millions before one's agreement' is the wordplay.
'millions' becomes 'm' (abbreviation).
'before' means one lot of letters go next to another.
'one's' becomes 'is' (Roman numeral).
'agreement' becomes 'deal' (deal is a kind of agreement).
'm'+'is'+'deal'='MISDEAL'
(Other definitions for misdeal that I've seen before include "Wrongly issue" , "Right hand that isn't" , "Faulty distribution" , "Faulty issue of cards" , "Give out the cards wrongly" .)