Angry at mere promises of payment for a coat (7)
I believe the answer is:
furious
'angry' is the definition.
(I know that angry can be written as furious)
'mere promises of payment for a coat' is the wordplay.
I cannot really understand how this works, but
'promises' could be 'ious' (promises to pay a debt) and 'ious' is located in the answer.
'coat' could be 'fur' (fur coat is a kind of coat) and 'fur' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'at' is the link.
Can you help me to learn more?
(Other definitions for furious that I've seen before include "how creditor feels?" , "Extremely angry" , "Enraged" , "Raging" , "at boiling point" .)