23 across
Thing
reversed
in
chart
I
revised
as
piece
of
mathematics
(10)
Thing reversed in chart I revised as piece of mathematics (10)
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The definition is at the end of the clue.
How the clue works
The definition is piece of mathematics. The wordplay involves three techniques working together: "thing" gives ITEM, which is "reversed" to become METI. Then "chart I revised" signals an anagram of CHART I, yielding ARITHC. METI is placed inside this anagram ("in"), giving ARITH-METI-C.