Crossword Genius

They're cold-blooded and they're calculating (6)

Ross

I believe the answer is:

adders

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


I'm afraid I can't explain this answer.

Can you help me to learn more?

(Other definitions for adders that I've seen before include "Do they deal with tots" , "Venomous snakes" , "Totting snakes" , "Poisonous types" , "Mathematical reptiles" .)

I've seen this clue in The Telegraph and The Globe and Mail.
Want a hint initially instead of a full solution? Install my app