Crossword Genius

Finished rehearsal getting words mixed up (3,3)

Ross

I believe the answer is:

run dry

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

'up' is the definition.
Although both the answer and definition are verbs in their base form, I cannot understand how they can define each other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for run dry that I've seen before include "Exhaust" , "go impassive" , "Come to an end" , "Cease to flow or have any water" , "get exhausted" .)

I've seen this clue in The Independent.
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