18 across
Something
sweet
in
hideaway
found
by
bare
neck
(6)
Something sweet in hideaway found by bare neck (6)
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The definition is at the beginning of the clue.
How the clue works
Look at Something sweet at the start — that's your definition, a cream-filled pastry. For the wordplay, take neck and strip it "bare" by removing its outer letters N and K, which leaves EC. Then put hideaway (LAIR) straight after it, as signalled by "found by", to build the pastry.