Crossword Genius

Poisonous snakes, they reckon (6)

Ross

I believe the answer is:

adders

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

'poisonous snakes' is the definition.
(I've seen this in another clue)

'they reckon' is the wordplay.
I cannot really understand how this works, but
'reckon' could be 'add' (reckon can mean to calculate) and 'add' is present in the answer.
The remaining letters 'ers' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for adders that I've seen before include "Sadder with snakes" , "Do they deal with tots" , "Venomous snakes" , "Mathematical snakes" , "Dreads (anag) -- snakes" .)

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