11 across
Day
in
Oxford,
say,
by
car
–
and
Slough
–
showing
no
sign
of
wear
(12)
Day in Oxford, say, by car – and Slough – showing no sign of wear (12)
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The definition is at the end of the clue.
How the clue works
Showing no sign of wear is your definition. You've got D (day) tucked inside UNI (Oxford, say — a university) to give UNDI, then MINI (car) followed by SHED (slough, as in to cast something off) tacked on the end.