Crossword Genius

Earnest talk disturbed cold-blooded creature (11)

Ross

I believe the answer is:

rattlesnake

I'm a little stuck... Click here to teach me more about this clue!

'cold-blooded creature' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'earnest talk disturbed' is the wordplay.
'disturbed' is an anagram indicator (the order of letters is disturbed).
'earnest'+'talk'='earnesttalk'
'earnesttalk' with letters rearranged gives 'RATTLESNAKE'.

Can you help me to learn more?

(Other definitions for rattlesnake that I've seen before include "Poisonous creature" , "Creepy type" , "Sidewinder" , "Heavy-bodied American pit viper" , "Venomous creature" .)

I've seen this clue in The Times.
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