Richmond MP once hot with fever (5)

I believe the answer is:

hague

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'richmond mp once' is the definition.
I can't judge whether this defines the answer.

'hot with fever' is the wordplay.
'hot' becomes 'h'.
'with' means one lot of letters go next to another.
'fever' becomes 'ague' (I've seen this before).
'h'+'ague'='HAGUE'

Can you help me to learn more?

(Other definitions for hague that I've seen before include "The city of the International Court of Justice" , "politician" , "The ..... is the Netherlands seat of government" , "William -, former Conservative leader" .)

I've seen this clue in The Independent.

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