Crossword Genius

Parry departs leaving bill (5)

Ross

I believe the answer is:

avert

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'parry' is the definition.
(I've seen this in another clue)

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

Can you help me to learn more?

(Other definitions for avert that I've seen before include "Turn away (ones eyes)" , "Turn away, prevent" , "Head off" , "Deflect away" , "Prevent, ward off" .)

I've seen this clue in The Sun.
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