Old-fashioned and formal about material matters (6)
I believe the answer is:
stuffy
'old-fashioned' is the definition.
(I've seen this before)
'formal about material matters' is the wordplay.
I cannot really see how this works, but
'material' could be 'stuff' (synonyms) and 'stuff' is located in the answer.
A single letter 'y' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'and' is the link.
Can you help me to learn more?
(Other definitions for stuffy that I've seen before include "Airless - humourless" , "Airless - pompous" , "needing to be aired" , "Lacking ventilation; narrow-minded" , "Staid - airless" .)