Agitated king cobra hunted quietly (2,3,10)

I believe the answer is:

in the background

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'quietly' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'agitated king cobra hunted' is the wordplay.
'agitated' indicates anagramming the letters.
'king'+'cobra'+'hunted'='kingcobrahunted'
'kingcobrahunted' with letters rearranged gives 'IN THE BACKGROUND'.

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I've seen this clue in The Daily Express.

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