Hostility surrounding a plot I concocted in the US Congress (7,4)

I believe the answer is:

capitol hill

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'the us congress' is the definition.
(I've seen this before)

'hostility surrounding a plot i concocted' is the wordplay.
'hostility' becomes 'chill' (I can't justify this - if you can you should give a lot more credence to this answer).
'surrounding' is an insertion indicator.
'concocted' indicates an anagram.
'a'+'plot'+'i'='aploti'
'aploti' with letters rearranged gives 'apitol'.
'chill' placed around 'apitol' is 'CAPITOL HILL'.

'in' is the link.

Can you help me to learn more?

(Other definitions for capitol hill that I've seen before include "US Congress" , "US location" .)

I've seen this clue in The Telegraph.

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