14 down
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
The definition is describing certain lenses — APLANATIC being the term for lenses corrected for spherical aberration. "Capital" gives you CAPITAL, and after editing signals an anagram of it, rearranging those letters to get APLATIC. Then to include a note means you pop in N (a musical note), giving you APLANATIC.