Crossword Genius

Very hot always inside cold-blooded animal (8)

Ross

I believe the answer is:

feverish

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'very hot' is the definition.

'always inside cold-blooded animal' is the wordplay.
'always' becomes 'ever' (synonyms).
'inside' is an insertion indicator.
'cold-blooded animal' becomes 'fish' (fish is a kind of animal. I am not sure about the 'cold-blooded' bit.).
'ever' put within 'fish' is 'FEVERISH'.

Can you help me to learn more?

(Other definitions for feverish that I've seen before include "in a tizz" , "Restlessly excited" , "Nervously excited" , "Frenzied" , "Restless with excitement or agitation - got ague?" .)

I've seen this clue in The Telegraph.
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