One French article, possibly Italian (4)

I believe the answer is:

unit

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'one' is the definition.
('unit' can be a synonym of 'one')

'french article possibly italian' is the wordplay.
'french article' becomes 'un' (French for 'a' - the indefinite article).
'possibly italian' becomes 'it' (I am not sure about the 'possibly' bit.**).
'un'+'it'='UNIT'

Can you help me to learn more?

(Other definitions for unit that I've seen before include "Single item; one" , "Single item, maybe part of a set" , "Part of a kit" , "Small group" , "Separate part" .)

I've seen this clue in the Evening Standard.

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