22 down
Greek
character
given
time
inside
–
mark
of
disgrace
(6)
Greek character given time inside – mark of disgrace (6)
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The definition is at the end of the clue.
How the clue works
The definition is mark of disgrace. Take SIGMA — your Greek character — and slot T (the standard abbreviation for time) inside it, giving you S, T, then IGMA.