17 across
Scatter
finest
roses
(except
white,
initially)
(7)
Scatter finest roses (except white, initially) (7)
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The definition is at the beginning of the clue.
How the clue works
The definition is Scatter. finest gives you BEST, then initially tells you to take the first letters of roses except white — R, E, W — and tack them on the end to get BESTREW.