Creature that's scaled high, guy can't say is totally wingless (6)

I believe the answer is:

iguana

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'creature that's scaled' is the definition.
(iguanas have scales)

I can't explain the remainder of the clue.

(Other definitions for iguana that I've seen before include "Arboreal lizard of S America" , "Tropical spiny lizard" , "Animal" , "Tropical tree-lizard" , "Large tree-climbing specimen of 5 down in tropical America" .)

I've seen this clue in The Telegraph.

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