Makes enemies using a porky pair of buttocks (9)

I believe the answer is:

alienates

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'makes enemies' is the definition.
Although both the answer and definition are verbs in their -s form, I can't see how they can define each other.

'a porky pair of buttocks' is the wordplay.
'porky' becomes 'lie' (I've seen this before).
'pair of buttocks' becomes 'nates' (I am not sure about this - if you are sure you should believe this answer much more).
'a'+'lie'+'nates'='ALIENATES'

'using' is the link.

Can you help me to learn more?

(Another definition for alienates that I've seen is " Transfers ownership of".)

I've seen this clue in the Sydney Morning Herald.

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