25 down
Brief
description
of
timeless
ballet
dancing
(5)
Brief description of timeless ballet dancing (5)
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The definition is at the beginning of the clue.
How the clue works
See "brief description" — that's your definition, a label being a short descriptive tag. Start with BALLET, whip out the T ("timeless" ditching the abbreviation for time), and you're left with BALLE, which needs a shuffle ("dancing") to land on LABEL.