Crossword Genius

Serpent is more evil, doing Bluth's head in! (5)

Ross

I believe the answer is:

adder

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

I can't explain the remainder of the clue.

(Other definitions for adder that I've seen before include "Viper common in northern Eurasia" , "Mathematical reptile" , "Venomous type" , "a poisonous type" , "calculator?" .)

I've seen this clue in The Independent.
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