3 down
Still
one
imagined
terrifying
creature
from
the
Himalayas
(4)
Still one imagined terrifying creature from the Himalayas (4)
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The definition is at the end of the clue.
How the clue works
See imagined terrifying creature from the Himalayas at the start — that's your definition, pointing to the legendary Yeti. For the wordplay, take YET as a synonym for "still" and add I for "one" straight after, giving you the beast.