Concerning money due no day following (7)
I believe the answer is:
retinue
'following' is the definition.
(I've seen this in another clue)
'concerning money due no day' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'money' becomes 'tin' (old-fashioned slang term for money).
'due no day' becomes 'ue' (I can't explain this - if you can you should give a lot more credence to this answer).
're'+'tin'+'ue'='RETINUE'
Can you help me to learn more?
(Other definitions for retinue that I've seen before include "Group of servants with important person" , "VIP's attendants" , "Cortege" , "Attendants, followers" , "Group of assistants" .)