Crossword Genius

Water used by drivers? (4)

Ross

I believe the answer is:

tees

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

'drivers?' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for tees that I've seen before include "Sides of Trent" , "Golf pegs" , "Middlesbrough's river" , "Stockton's river" , "banker" .)

I've seen this clue in the Evening Standard.
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