Crossword Genius

It is parliament that’s reformed, including one opposed to colonies (4-11)

Ross

I believe the answer is:

anti-imperialist

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'it is parliament that's reformed including one opposed to colonies' is the definition.
The definition suggests a singular noun which matches the answer.

'it is parliament that's reformed including one' is the wordplay.
'it is' becomes 'itis'.
'that's reformed' indicates anagramming the letters.
'including' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'itis'+'parliament'='itisparliament'
'itisparliament' is an anagram of 'antimperialist'.
'antimperialist' placed around 'i' is 'ANTI-IMPERIALIST'.

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