17 across
Hearts,
the
first
discarded
by
those
not
twisting?
(7)
Hearts, the first discarded by those not twisting? (7)
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The definition is at the beginning of the clue.
How the clue works
Hearts is your definition here, slang for tickers - as in, the heart itself. For the wordplay, think of the card game where you either twist or stick - "those not twisting" gives you STICKERS, and the clue tells you to discard the first letter, leaving TICKERS.