With credit blown, biscuits and gravy (6)

I believe the answer is:

ackers

I'm a little stuck... Click here to teach me more about this clue!

'gravy' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ackers that I've seen before include "bread" , "Money (slang)" .)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app