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Somewhat
unorthodox
position
of
negative
pole
(5)
Somewhat unorthodox position of negative pole (5)
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The definition is at the end of the clue.
How the clue works
Look at position of negative pole — that's your definition, since the north pole of a magnet is indeed the negative pole. Then "Somewhat" tips you off that the answer is hiding inside the phrase itself, and sure enough, uNORTHodox has it tucked right in there.