22 across
A
Western
losing
Oscar
–
that’s
unexpected
(10)
A Western losing Oscar – that’s unexpected (10)
hints
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The definition is at the end of the clue.
How the clue works
Right, so that's unexpected is the definition, pointing to "accidental." For the wordplay, start with A, then take OCCIDENTAL as your word for Western, and whip out the O — that's Oscar in the phonetic alphabet. Stick A onto what's left of OCCIDENTAL and you're left with ACCIDENTAL.