26 across
Short
walk
in
once
moving
moonlit
scene
(8)
Short walk in once moving moonlit scene (8)
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The definition is at the end of the clue.
How the clue works
Look at moonlit scene — that's your definition, the kind of atmospheric image a nocturne conjures in painting or music. Now for the wordplay: "once moving" signals an anagram of ONCE, giving you NOCE, and then you insert TURN (a short walk) into the middle of it, landing you on NOC-TURN-E.