18 across
Oh
no,
a
Trump,
terrible
–
being
not
quite
one
of
us!
(10)
Oh no, a Trump, terrible – being not quite one of us! (10)
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The definition is at the end of the clue.
How the clue works
Look at being not quite one of us — that's your definition, a protohuman being not fully human. Then "terrible" is your anagram indicator, and scrambling the letters of Oh no a Trump gives you the answer.