Tore up to support very popular dealer in Bordeaux (7)
I believe the answer is:
vintner
'dealer in bordeaux' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?
'tore up to support very popular' is the wordplay.
'tore' becomes 'rent' (rending is a kind of tearing).
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'to support' means one lot of letters go next to another (in a down clue, some letters hold others up).
'very' becomes 'v' (abbreviation).
'popular' becomes 'in' ('in' can mean trendy).
'rent' backwards is 'tner'.
'v'+'in'='vin'
'tner' after 'vin' is 'VINTNER'.
Can you help me to learn more?
(Other definitions for vintner that I've seen before include "A wine-merchant" , "Wine producer" , "Wine seller" , "Wine merchant" , "one in red and white?" .)