3 down
Irregular
force
that
may
be
out
at
night
(5,5)
Irregular force that may be out at night (5,5)
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The definition is at the end of the clue.
How the clue works
The whole answer is a witty nod to that may be out at night, since people take their dentures out before bed. The building blocks come from FALSE meaning "Irregular" and TEETH meaning "force" (as when a toothless law lacks teeth), strung together to give FALSE TEETH.