Cold-blooded vertebrate (7)

I believe the answer is:

reptile

'cold-blooded vertebrate' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for reptile that I've seen before include "Serpent" , "Malignant creature" , "Snake or crocodile, say" , "Eg, snake, lizard, etc" , "eg Crocodile" .)

I've seen this clue in The Telegraph, The Irish Times and The Independent.

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