Viper (5)

I believe the answer is:

adder

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

This is all the clue.

(Other definitions for adder that I've seen before include "a poisonous type" , "venomous creature" , "Totting snake" , "Viper common in northern Eurasia" , "Snake (like an abacus?)" .)

I've seen this clue in The Mirror, The Irish Independent, The Sun, The Telegraph, the Evening Standard, The Independent and the Penny Press.

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