Crossword Genius

Water tester (3)

Ross

I believe the answer is:

'water tester' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for toe that I've seen before include "one digit?" , "End of sock" , "Pedal digit" , "Front of shoe" , "Part of foot" .)

I've seen this clue in The Times, the King Feature Syndicate and The Sunday Times.
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