9 down
Remarks
that
may
require
revisions,
up
or
down
(13)
Remarks that may require revisions, up or down (13)
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The whole clue is the definition (& lit or double definition).
How the clue works
The whole clue works as a cryptic definition: read "remarks" not as things you say, but as *re-marks* — marking again — which is exactly what reassessments are. The "up or down" nudges you towards the idea that these revisions could go either way, and the whole surface hangs on that double sense of "remarks".