Crossword Genius

Having got away without paying? (4)

Ross

I believe the answer is:

free

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'paying?' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I don't see?

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

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(Other definitions for free that I've seen before include "Let loose" , "Reef (anag.)" , "On the house" , "As cheap as can be!" , "Not employed" .)

I've seen this clue in the Evening Standard.
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