Greeks charge carriers for carrying one article (7)

I believe the answer is:

ionians

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'greeks' is the definition.
(Ionian is an example)

'charge carriers for carrying one article' is the wordplay.
'charge' becomes 'ion' (an ion is a charged particle).
'carriers for' becomes 'is' (I can't explain this - if you can you should believe this answer much more).
'carrying' means one lot of letters goes inside another.
'one article' becomes 'an' (indefinite article).
'is' going around 'an' is 'ians'.
'ion'+'ians'='IONIANS'

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I've seen this clue in The Independent.

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