9 across
Tense
card
game
discarding
hearts?
That’s
unexpected
(5)
Tense card game discarding hearts? That’s unexpected (5)
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The definition is at the end of the clue.
How the clue works
The definition is That's unexpected, since a twist is an unexpected turn of events. For the wordplay, start with T for tense, then take WHIST (the card game) and drop its H (discarding hearts), leaving WIST. Stick the two together and you've got your answer.