7 down
Late
meeting
of
party
in
bishop’s
office
(6)
Late meeting of party in bishop’s office (6)
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The definition is at the beginning of the clue.
How the clue works
Right, so Late meeting is the definition — a séance being a gathering where you try to contact the dead, the "late" ones. For the wordplay, the party is ANC (African National Congress), and you tuck that inside SEE, which is a bishop's office, giving you SE-ANC-E.