Dog suppressing disgusted expression in entrance (7)
I believe the answer is:
bewitch
'entrance' is the definition.
(I know that entrance can be written as bewitch)
'dog suppressing disgusted expression in' is the wordplay.
'dog' becomes 'bitch' (I've seen this before).
'suppressing' is an insertion indicator.
'disgusted expression in' becomes 'ew' (I can't explain this - if you can you should believe this answer much more).
'bitch' placed around 'ew' is 'BEWITCH'.
Can you help me to learn more?
(Other definitions for bewitch that I've seen before include "Captivate" , "add glamour" , "Spellbind" , "Enchant - or curse" , "Entrance" .)