The most common and most likely answer to this crossword clue is the 4 plus 6 letter word MAIN COURSE
I've seen this crossword clue in The Guardian
M
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N
C
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More clues leading to the result MAIN COURSE
- Filling dish, not one intended for rabbits
- Route travelled by boat, traditÂional follower of fish?
- A substantial amount to digest in principal series of lectures?
- … and principal one in shipping lane?
- Principal meal, picked up on tray
- Sail with a thousand on a cruise at sea
- Seafood platter?
- Direction taken by sailor? One makes a bit of a meal of it!
- After it comes sweet decision
- A consumer, I munched turkey at Christmas?
Buddy explains!

The straight part
We know that "Principal meal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case principal meal = main course.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.