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 cannot understand how the remainder of the clue works.

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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 Sunday Times and The Times.
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