The most common and most likely answer to this crossword clue is the 7 letter word REPTILE
R
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More clues leading to the result REPTILE
- Alligator is one regarding soft floor covering
- Repel it, horrible snake?
- Traveller with hat a loathsome person
- Salesman with hat one loathed
- Through raised roof, see diplodocus, maybe
- Stormy petrel grabbing head of Indian snake?
- Drunken peer, fired up inside – treacherous type
- Salesman with hat, despicable type
- Base person‘s cloth hat
- Traveller, not quite the best, turning turtle perhaps
Buddy explains!

The straight part
We know that "cold blooded creature" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cold blooded creature = reptile.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does REPTILE mean?
REPTILE noun- A cold-blooded vertebrate of the class Reptilia.
- A mean or grovelling person.
- Creeping; moving on the belly, or by means of small and short legs.
- Grovelling; low; vulgar.