Spiny reptile (6)

I believe the answer is:

iguana

(Other definitions for iguana that I've seen before include "Large lizard found in Guiana" , "Arboreal lizard of S America" , "Large crested lizard" , "Arboreal lizard with a spiny crest" , "Lizard Darwin found in the Galapagos" .)

I've seen this clue in the King Feature Syndicate.

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