Against party being unfriendly (10)

I believe the answer is:

antisocial

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'unfriendly' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I can't see?

'against party' is the wordplay.
'against' becomes 'anti' (prefix meaning against).
'party' becomes 'social' (social can mean a party or event).
'anti'+'social'='ANTISOCIAL'

'being' is the link.

Can you help me to learn more?

(Other definitions for antisocial that I've seen before include "Avoiding the company of others" , "Not getting on with others" , "Disruptive to the community" , "withdrawn" , "Reluctant to mix" .)

I've seen this clue in The Daily Express.

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