19 down
Emerging
from
green
terrace,
go
back
in
(2-5)
Emerging from green terrace, go back in (2-5)
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The definition is at the end of the clue.
How the clue works
Right, go back in is the definition — that's just "re-enter" plain and simple. Now look at "green terrace": "Emerging from" tells you we're digging an answer out of the letters themselves, and sure enough it's lurking there, hidden across the join — g-REENTER-race.