11 across
Excitedly
recording
chats
about
origin
of
Sasquatch,
a
creature
that
may
not
exist
(12,3)
Excitedly recording chats about origin of Sasquatch, a creature that may not exist (12,3)
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The definition is at the end of the clue.
How the clue works
The definition is a creature that may not exist, which is the famous thought-experiment cat. For the wordplay, 'excitedly' signals an anagram of RECORDING CHATS, and 'origin of Sasquatch' hands you an S to add to the pile. Shuffle all those letters together and out comes SCHRODINGERS CAT.