The most common and most likely answer to this crossword clue is the 9 letter word SCRAPPIER
S
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A
P
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Buddy explains!
The straight part
We know that "Less organised/killjoys might like to do it at Brighton" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case less organised/killjoys might like to do it at brighton = scrappier.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 SCRAPPIER mean?
SCRAPPIER adjective- Consisting of scraps; fragmentary; lacking unity or consistency.
- Having an aggressive spirit; inclined to fight or strive.
- (Of a fight) characterised by lots of ungainly or wild punches, grabs, wrestling, etc.
- (Of a sports match) characterised by awkward or clumsy play.