A dish to be promoted as Wellington, perhaps (7)
I believe the answer is:
gumboot
'wellington perhaps' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'a dish to be promoted' is the wordplay.
'a dish' becomes 'gumbo' (gumbo is a kind of dish).
'be promoted' says the letters should be written backwards (going up, in a down clue).
'to' reversed gives 'ot'.
'gumbo'+'ot'='GUMBOOT'
'as' is the link.
Can you help me to learn more?
(Other definitions for gumboot that I've seen before include "Waterproof footwear" , "Wader" , "Wellington" .)