Appropriate money, one million up front (7)
I believe the answer is:
impound
'appropriate' is the definition.
(thesaurus)
'money one million up front' is the wordplay.
'money' becomes 'pound' (I've seen this before).
'one million' becomes 'im' (I've seen this in other clues).
'up front' says to put letters next to each other.
'pound' put after 'im' is 'IMPOUND'.
(Other definitions for impound that I've seen before include "Seize (goods) legally" , "Shut up" , "Confiscate" , "Take property into legal custody" , "Seize and take into legal custody" .)