Is such water deep? (3)

I believe the answer is:

low

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'deep?' is the definition.
(similar in meaning)

I cannot understand how the remainder of the clue works.

(Other definitions for low that I've seen before include "Deep; moo" , "Not high - that's mean" , "Not elevated, may be base" , "Without great height" , "Deep sound of cattle - not high" .)

I've seen this clue in the Evening Standard.

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