Round Italian green has unionist unsettled (7)
I believe the answer is:
overdue
'unsettled' is the definition.
(I've seen this before)
'round italian green has unionist' is the wordplay.
'round' becomes 'o' (round can mean a round object).
'italian green' becomes 'verde' (I am not sure about this - if you are sure you should believe this answer much more).
'has' is an insertion indicator.
'unionist' becomes 'u' (abbreviation as in Democratic Unionist Party).
'verde' placed around 'u' is 'verdue'.
'o'+'verdue'='OVERDUE'
Can you help me to learn more?
(Other definitions for overdue that I've seen before include "Opposite of 1 ac." , "Remaining unpaid after the scheduled time" , "unsettled" , "Late like unpaid bill" , "Late, outstanding like bill" .)