Optimism with our group taking over power in parliament (5)

I believe the answer is:

house

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

'over power in parliament' is the definition.
'house' can be an answer for 'parliament' (the House of Commons). I'm not sure about the 'over power in' bit.

'optimism with our group' is the wordplay.
'optimism' becomes 'hoe' (I can't justify this - if you can you should believe this answer much more).
'with' is an insertion indicator.
'our group' becomes 'us'.
'hoe' placed around 'us' is 'HOUSE'.

'taking' acts as a link.

Can you help me to learn more?

(Other definitions for house that I've seen before include "Domestic building" , "Dwelling; dynasty" , "Store" , "SECOND PART OF 19" , "Domicile" .)

I've seen this clue in The Independent.

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