12 across
Atmosphere
that’s
spoken
of
before
in
poetry
(3)
Atmosphere that’s spoken of before in poetry (3)
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The definition is at the end of the clue.
How the clue works
Right, so the definition's tucked away at before in poetry, which is exactly what ERE means in old-fashioned verse. For the wordplay, "atmosphere" gives you AIR, and "that's spoken of" is your homophone signal — say AIR out loud and it sounds just like ERE.