15 down
Is
dividing
lyric
poems
–
they’re
presented
on
separate
occasions
(8)
Is dividing lyric poems – they’re presented on separate occasions (8)
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The definition is at the end of the clue.
How the clue works
Look at they're presented on separate occasions — that's your definition, thinking of TV episodes aired at different times. For the wordplay, you've got IS slotted inside EPODES (lyric poems), because the clue tells you IS is "dividing" them — giving you EP-IS-ODES.