21 across
It’s
monstrous
if
that
man
is
preceding
one
drawn
to
light
(8)
It’s monstrous if that man is preceding one drawn to light (8)
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The definition is at the beginning of the clue.
How the clue works
The definition is It's monstrous — a behemoth being a huge, terrifying creature. For the wordplay, piece together a charade: if signals the subjunctive, giving you BE for "is", then that man is HE, and one drawn to light is a MOTH — put them all together in order and there's your answer.