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Lizards in Nicaragua somehow avoiding car (6)

Ross

I believe the answer is:

iguana

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'car' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for iguana that I've seen before include "Tropical spiny lizard" , "cold-blooded customer!" , "Large tree-climbing lizard of tropical America" , "Large lizard of tropical Amercia" , "Something like a monitor" .)

I've seen this clue in The Sun.
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