I will be involved in Capitol manoeuvring almost entirely? Not if this (10)

I believe the answer is:

apolitical

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'i' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for apolitical that I've seen before include "linked to no party" , "Indifferent to MP's business" , "Not interested in party business" , "Favouring none of the parties" .)

I've seen this clue in The Independent.

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