Crossword Genius

Has its main supplier, that's clear (5)

Ross

I believe the answer is:

water

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'clear' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for water that I've seen before include "Compound of hydrogen and oxygen" , "Commonplace drink" , "Basic liquid" , "One of the four classical elements" , "What makes the Somme" .)

I've seen this clue in the Evening Standard.
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