Crossword Genius

Snake upset king (7)

Ross

I believe the answer is:

rattler

'snake' is the definition.
(I know that rattler is a type of pit viper)

'upset king' is the wordplay.
'upset' becomes 'rattle' (I've seen this before).
'king' becomes 'R' (abbreviation for rex, king in Latin).
'rattle'+'r'='RATTLER'

(Other definitions for rattler that I've seen before include "Nickname for a pit viper in the US" , "(it crawls?)" , "old crate" , "American pit viper (informal)" , "A noisy American snake" .)

I've seen this clue in The Sun and The Times.
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