The most common and most likely answer to this crossword clue is the 8 letter word MOUSSAKA
I've seen this crossword clue in The Daily Telegraph
M
O
U
S
S
A
K
A
More clues leading to the result MOUSSAKA
- Cut dessert, otherwise called a meat dish
- Mostly light eggy dish also called layered dish
- Doctor is going to ask us about a dish we’ve eaten abroad
- Dish that’s first of many set before us in Japanese city
- Second American vessel, sometimes called a dish
- …light dish, not English, alternatively a Greek speciality
- Incomplete dessert, otherwise termed a Greek dish
- Dessert mainly otherwise known as main course
- Most of light dish otherwise called a casserole
- Dish for preparing oakum to protect area on ship
Buddy explains!

The straight part
We know that "main course" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case main course = moussaka.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does MOUSSAKA mean?
MOUSSAKA noun- A dish consisting of layers of minced lamb or beef, sliced aubergine (eggplant) or potatoes, tomatoes and béchamel sauce, baked in the oven.
- A dish consisting of layers of minced lamb or beef, sliced aubergine (eggplant) or potatoes, tomatoes and béchamel sauce, baked in the oven.