Crossword Genius

What Giuliani used to do is not solid (5)

Ross

I believe the answer is:

runny

'is not solid' is the definition.

I don't understand how the remainder of the clue works.

(Other definitions for runny that I've seen before include "Inclined to be rather liquid" , "Molten" , "Tending to flow" , "Not set, inclined to spread" , "(Exuding) liquid" .)

I've seen this clue in The Guardian.
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