The most common and most likely answer to this crossword clue is the 6 letter word LATHIS
I've seen this crossword clue in The Times
L
A
T
H
I
S
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The straight part
We know that "clubs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case clubs = lathis.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 LATHIS mean?
LATHIS noun- A heavy stick or club, usually used by policemen.
- A martial art based on stick fighting originally practiced in India.