15 down
Alumni’s
pub
evening
is
a
thing!
(9)
Alumni’s pub evening is a thing! (9)
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hints
The definition is at the end of the clue.
How the clue works
The definition is a thing!, referring to an obsession as something one is fixated on. OBS (alumni, short for old boys) is followed by SESSION (a pub evening or drinking session) to give OBSESSION.