Snake concealed in Hickstead Derby (5)

I believe the answer is:

adder

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

'concealed in hickstead derby' is the wordplay.
'concealed in' indicates the answer is hidden within the clue.
'ADDER' can be found hidden inside 'hickstead derby'.

(Other definitions for adder that I've seen before include "Small poisonous snake, viper" , "poisoner" , "Viper common in northern Eurasia" , "Reptilian" , "Britain's only venomous snake" .)

I've seen this clue in The Sun.

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