Unsettled round greenery where last rook departs (7)
I believe the answer is:
overdue
'unsettled' is the definition.
(I've seen this before)
'round greenery where last rook departs' is the wordplay.
I cannot really understand how this works, but
'round' could be 'o' (round can mean a round object) and 'o' is found in the answer.
'rook' could be 'r' (chess abbreviation) and 'r' is found in the answer.
'departs' could be 'd' (common abbreviation e.g. train timetables) and 'd' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for overdue that I've seen before include "Not paid at the scheduled time" , "Of payment, past the required date" , "Later than the appointed time, as for bill payment" , "Beyond the expected time" , "Remaining unpaid after the scheduled time" .)