Type to cheat, billions going missing (3)
I believe the answer is:
ilk
'type' is the definition.
(ilk can mean a type or kind)
'cheat billions going missing' is the wordplay.
'cheat' becomes 'bilk' (bilk means to cheat or swindle).
'billions' becomes 'b' (abbreviation).
'going missing' suggests deleting specific letters.
'bilk' with 'b' taken out is 'ILK'.
'to' acts as a link.
(Other definitions for ilk that I've seen before include "Description" , "A kind of person" , "Type - kind" , "Kind, class" , "Kind of silks" .)