18 down
Quickly
observe
little
devils
in
endless
merriment
(7)
Quickly observe little devils in endless merriment (7)
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The definition is at the beginning of the clue.
How the clue works
The definition is Quickly observe — a brief look. Take merriment, that's GLEE, and strip its last letter ("endless") to get GLE-, then tuck little devils (IMPS) inside it to give you GL-IMPS-E.