Nasty extreme tin automaton's opener? (11)

I believe the answer is:

exterminate

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'nasty extreme tin automaton's opener?' is the definition.
I can't tell whether this defines the answer.

'nasty extreme tin automaton's opener?' is the wordplay.
'nasty' indicates anagramming the letters.
'opener?' suggests taking the first letters (I've seen 'opener' mean this).
The first letter of 'automatons' is 'a'.
'extreme'+'tin'+'a'='extremetina'
'extremetina' is an anagram of 'EXTERMINATE'.

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(Other definitions for exterminate that I've seen before include "Annihilate" , "Finally do away" , "Dalek's order to kill" , "Get rid of" , "Finish off" .)

I've seen this clue in The Telegraph.

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