Article to accompany one-on-one in Ancient Greek (6)
I believe the answer is:
ionian
'ancient greek' is the definition.
'Ionian' can be an answer for 'greek' (Ionian is an example). I'm unsure of the 'ancient' bit.
'article to accompany one-on-one' is the wordplay.
'article' becomes 'an' (indefinite article).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'accompany one on' becomes 'ion' (I am not sure about this - if you are sure you should believe this answer much more).
'one' becomes 'i' (Roman numeral).
'ion'+'i'='ioni'
'an' after 'ioni' is 'IONIAN'.
'in' is the link.
Can you help me to learn more?
(Other definitions for ionian that I've seen before include "Sea between southern Italy and western Greece" , "Sea between Greece and Sicily" , "from Greek Islands" , "Sea between Greece and south Italy" .)