Crossword Genius

Modified umbel on water plant (7)

Ross

I believe the answer is:

nelumbo

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'plant' is the definition.
The answer is an example.

I can't explain the rest of the clue.

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(Other definitions for nelumbo that I've seen before include "Flower" , "plant" , "Water lily" .)

I've seen this clue in The Times and The Sunday Times.
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