ABC air foul language (6)

I believe the answer is:

arabic

'language' is the definition.
(Arabic is a language)

'abc air foul' is the wordplay.
'foul' is an anagram indicator.
'abc'+'air'='abcair'
'abcair' with letters rearranged gives 'ARABIC'.

(Other definitions for arabic that I've seen before include "Common language of Middle East" , "Language (of numbers)" , "Gum --, ingredient of glue and incense" , "Major language of Middle East" , "foreign language" .)

I've seen this clue in The Sun.

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