Crossword Genius

Stand up, as might pitcher? (4,5)

Ross

I believe the answer is:

hold water

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'stand up' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for hold water that I've seen before include "make sense?" , "Window-cleaners use buckets to" , "wash" , "Kettle will usually" , "Be credible" .)

I've seen this clue in The Times.
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