Such cards are no credit to anyone (5)
I believe the answer is:
debit
'such cards are' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for debit that I've seen before include "Record of a sum owed" , "Sum taken from account" , "Payment made or owed" , "Sum removed from a bank account" , "Accounting entry showing sums owing" .)