Tortoise, say (7)
I believe the answer is:
reptile
'tortoise say' is the definition.
(tortoise is a kind of reptile)
This is all the clue.
(Other definitions for reptile that I've seen before include "Cold-blooded beast" , "Cold-blooded vertebrate" , "Cold-blooded creature" , "Snake or croc?" , "Eg, snake, lizard, etc" .)