20 across
Like
the
part
of
Africa
that
is
below
the
sand?
(3-7)
Like the part of Africa that is below the sand? (3-7)
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The whole clue is the definition (& lit or double definition).
How the clue works
The definition is Like the part of Africa that is below the sand? — the whole clue works as a cryptic definition. The fun is in reading "below the sand" literally: sub meaning below, and Saharan pointing to the great sandy desert, which together give you the compound adjective describing that vast region south of the Sahara.