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Orchids,
originally
unaltered,
an
ikebana
requirement?
(5)
Orchids, originally unaltered, an ikebana requirement? (5)
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The definition is at the end of the clue.
How the clue works
Take the first letter of Orchids (indicated by "originally") to get O, then add AS IS meaning "unaltered". Together they spell OASIS, the floral foam used in flower arranging — an ikebana requirement, though purists might quibble.