12 across
Son
lazed
about
and
moved
furtively
(6)
Son lazed about and moved furtively (6)
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The definition is at the end of the clue.
How the clue works
The definition is moved furtively, meaning to move sideways in a sneaky manner. The wordplay is a charade: S is a standard abbreviation for "Son", and IDLED means "lazed about". Put them together and you get S + IDLED = SIDLED.