Crossword Genius

Vipers can make one sadder (6)

Ross

I believe the answer is:

adders

'vipers' is the definition.
(adder is a kind of viper)

'make one sadder' is the wordplay.
'make' is an anagram indicator.
'sadder' is an anagram of 'ADDERS'.

'can' acts as a link.

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

I've seen this clue in the Evening Standard.
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