Irish party suppressing new fad, left-wing and philistine (10)

I believe the answer is:

uncultured

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'philistine' is the definition.
(thesaurus)

'irish party suppressing new fad left-wing' is the wordplay.
'irish party' becomes 'uu' (I can't justify this - if you can you should give a lot more credence to this answer).
'suppressing' indicates putting letters inside.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'fad' becomes 'cult' (synonyms).
'left wing' becomes 'red' (red can informally mean communist).
'n'+'cult'='ncult'
'uu' placed around 'ncult' is 'uncultu'.
'uncultu'+'red'='UNCULTURED'

'and' acts as a link.

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I've seen this clue in The Independent.

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