Gourmet's dog tucked into English pie (7)
I believe the answer is:
epicure
'gourmet's' is the definition.
(synonyms)
'dog tucked into english pie' is the wordplay.
'dog' becomes 'cur' (a cur is an aggressive or scruffy dog).
'tucked into' means one lot of letters goes inside another.
'english' becomes 'E' (abbreviation).
'e'+'pie'='epie'
'cur' placed inside 'epie' is 'EPICURE'.
(Other definitions for epicure that I've seen before include "Gourmet" , "Lover of good food and drink" , "Person with refined taste in food and drink" , "Person with refined tastes in food and drink" , "Liker of fine food/drink" .)