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Capital,
after
editing,
to
include
a
note
describing
certain
lenses
(9)
Capital, after editing, to include a note describing certain lenses (9)
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The definition is at the end of the clue.
How the clue works
"After editing" signals an anagram of Capital, which needs to wrap around A N (a musical note) thanks to the containment indicator "to include". Shuffling CAPITAL around AN yields APLANATIC, describing certain lenses that correct for spherical aberration.