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There
but
for
all
to
see,
our
most
prominent,
looking
skyward?
(5)
There but for all to see, our most prominent, looking skyward? (5)
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The whole clue is the definition (& lit or double definition).
How the clue works
This is a lovely &lit clue where the whole thing — There but for all to see, our most prominent, looking skyward? — describes the constellation you can spot on a clear night. For the wordplay, you take OUR and knock out U (the Universal film rating, cued by "for all to see", with "but" telling you to exclude it), giving OR, then "most prominent" gives you No. 1, spelled NOI, which gets flipped upward to ION, and the lot spells out your answer.