Burgundy wine found by outskirts of Youghal - that's material (5)
I believe the answer is:
vinyl
'material' is the definition.
The definition and answer can be both substances as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'burgundy wine found by outskirts of youghal' is the wordplay.
'burgundy wine' becomes 'vin' (I can't justify this - if you can you should give a lot more credence to this answer).
'found by' is a charade indicator (letters next to each other).
'outskirts of' suggests removing the centre (only letters on the outskirts).
'youghal' with its middle removed is 'yl'.
'vin'+'yl'='VINYL'
'that's' is the link.
Can you help me to learn more?
(Other definitions for vinyl that I've seen before include "A plastic (LPs)" , "Plastic used for gramophone records" , "& 24 Across Pre-CD disc" , "Old record material" , "Shiny, tough and flexible material used for floor coverings" .)