Main course (6)
'main course' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for entree that I've seen before include "The right ot privilege of admission" , "Means of access - course" , "Privilege of admission, or food dish" , "Principal dish of a meal" , "Main course dish" .)
(Another definition for entre that I've seen is " - - nous (Fr.)".)