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Japanese
work
hard,
assiduous
in
keeping
up
with
the
leaders
(5)
Japanese work hard, assiduous in keeping up with the leaders (5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Japanese work — specifically that short form of poetry. "The leaders" tells you to take the first letters of hard, assiduous, in keeping up, and stringing those together spells it out nicely.