Crossword Genius

Plant often given water (5)

Ross

I believe the answer is:

cress

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'plant' is the definition.
(cress plant is a kind of plant)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for cress that I've seen before include "Salad sprouts" , "Toll of bell" , "Plant with leaves used in salad or as garnish" , "Cruciferous salad plant" , "bit of salad" .)

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