4 across
Get
over
arch,
and
one
may
make
a
bolt
for
it
(8)
Get over arch, and one may make a bolt for it (8)
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The definition is at the end of the clue.
How the clue works
Look at one may make a bolt for it — that's your definition, since a crossbow fires bolts. For the wordplay, it's a charade: CROSS meaning "get over", followed by BOW meaning "arch".