Hertz rival (4)
I believe the answer is:
'hertz rival' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for avis that I've seen before include "Unusual bird or extraordinary person - rara ?." , "Rara --, rare bird (or car rental firm)" .)
I've seen this clue in The Washington Post, the LA Times, the Newsday and the King Feature Syndicate.
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