18 down
Arrive
before
opening
of
park,
and
go
back
(7)
Arrive before opening of park, and go back (7)
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The definition is at the beginning of the clue.
How the clue works
Right, so Arrive before is your definition there, that's what "precede" means. For the wordplay, just take the opening of "park", giving you P, then stick RECEDE (meaning "go back") on the end — P plus RECEDE gives you the answer.