Believe in "Buy now, pay later"? (6)
I believe the answer is:
credit
'believe' is the definition.
(I know that credit is a more specific form of the action trust)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for credit that I've seen before include "Distinction -- attribute" , "Good reputation; tick" , "Reputation (for solvency)" , "Record of sum received" , "This bank balance is a plus" .)