18 down
Duke
defending
a
theologian,
one
given
to
temporary
obsession?
(7)
Duke defending a theologian, one given to temporary obsession? (7)
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The definition is at the end of the clue.
How the clue works
Here one given to temporary obsession is a faddist. "Duke" gives FIST (as in raising your dukes for a fight), and that's defending — wrapped around — A plus DD for theologian (Doctor of Divinity). Slot A DD inside FIST and you spell out FADDIST.