The most common and most likely answer to this crossword clue is the 5 letter word CROWD
I've seen this crossword clue in The Times
C
R
O
W
D
Buddy explains!
The straight part
We know that "Large group" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case large group = crowd.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 CROWD mean?
CROWD noun- A group of people congregated or collected into a close body without order.
- Several things collected or closely pressed together; also, some things adjacent to each other.
- (with definite article) The so-called lower orders of people; the populace, vulgar.
- A group of people united or at least characterised by a common interest.
- To press forward; to advance by pushing.
- To press together or collect in numbers
- To press or drive together, especially into a small space; to cram.
- To fill by pressing or thronging together
- (often used with "out of" or "off") To push, to press, to shove.
- To approach another ship too closely when it has right of way.
- (of a square-rigged ship) To carry excessive sail in the hope of moving faster.
- To press by solicitation; to urge; to dun; hence, to treat discourteously or unreasonably.
- (now dialectal) A fiddle.
- To play on a crowd; to fiddle.
- An archaic stringed instrument associated particularly with Wales, though once played widely in Europe, and characterized by a vaulted back and enough space for the player to stop each of the six strings on the fingerboard.