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Rare
occurrence
of
adult
at
low
end
of
chain
(4,4)
Rare occurrence of adult at low end of chain (4,4)
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How the clue works
Here the definition is Rare occurrence, and the rest is built in three chunks. You've got BLUE for "adult" (think blue film), then MOO for "low" (as a cow does), and finally N, which is the "end of chain" and so its last letter. Stick those together and you've got your rare occurrence.