Crossword Genius

Stream of purest water (3)

Ross

I believe the answer is:

ure

I'm a little stuck... Click here to teach me more about this clue!

'stream' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'of purest water' is the wordplay.
'of' indicates a hidden word.
'URE' is hidden in the letters of 'purest water'.

Can you help me to learn more?

(Other definitions for ure that I've seen before include "Ripon's river" , "Midge --, singer" , "River of N. Yorkshire" , "North Yorkshire river" , "Wensleydale river" .)

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