Low, venomous, calculating creatures? (6)
I believe the answer is:
adders
'low venomous calculating creatures?' is the definition.
The answer and definition can be both animals as well as being plural nouns.
Perhaps there's a link between them I don't understand?
This is the entire clue.
Can you help me to learn more?
(Other definitions for adders that I've seen before include "Poisonous types" , "People doing sums" , "Snakes are totters" , "Re Dad's snakes" , "Arithmetic snakes?" .)