The most common and most likely answer to this crossword clue is the 6 plus 4 letter word SQUARE MEAL
I've seen this crossword clue in Financial Times
S
Q
U
A
R
E
M
E
A
L
More clues leading to the result SQUARE MEAL
- It can still be served on a round plate!
- Good feed making Spooner’s horse kick up a fuss
- Talk about member preserving energy — that’s healthy and satisfying
- Substantial food male chewed after nine?
- Not food for those at the Round Table?
- Sing around a musical group offering regular fare?
- Scream with delight about a pop band — decent fare?
Buddy explains!
The straight part
We know that "It can still be served on a round plate" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it can still be served on a round plate = square meal.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.