Dislike of one form (8)

I believe the answer is:

aversion

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'dislike' is the definition.
(aversion is a kind of dislike)

'of one form' is the wordplay.
I cannot quite understand how this works, but
'of' could be 'o' and 'o' is found in the answer.
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for aversion that I've seen before include "distaste" , "A version of strong dislike" , "Disgust" , "Extreme dislike" , "serious dislike" .)

I've seen this clue in The Irish Independent.

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