Lizard with a spiny crest (6)

I believe the answer is:

iguana

(Other definitions for iguana that I've seen before include "Large tree-climbing specimen of 5 down in tropical America" , "American lizard with a spiny crested back" , "Tropical spiny lizard" , "Large crested lizard" , "Type of lizard" .)

I've seen this clue in The Wall Street Journal.

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