12 across
Shine
with
half-century
in
fluctuating
game
(5)
Shine with half-century in fluctuating game (5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Shine. "Half-century" gives you L (a century is 100, which is C in Roman numerals, but half of that — 50 — is L), and you stick that inside game before scrambling the whole lot, since fluctuating tells you the letters are being rearranged.