What hell I must suffer in corridors of power! (9)

I believe the answer is:

whitehall

I'm a little stuck... Click here to teach me more about this clue!

'corridors of power' is the definition.
(the UK civil service is based in Whitehall)

'what hell i must suffer' is the wordplay.
'what hell i' can be anagrammed to 'WHITEHALL'.
Though, I am not sure how the anagram is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for whitehall that I've seen before include "Street symbolising British government" , "admin staff here" , "Government policy" , "Administrators" .)

I've seen this clue in The Times.

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