In arrears (6)
'in arrears' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for behind that I've seen before include "Astern" , "Hidden by; in arrears" , "Responsible for" , "Hidden by; bottom" , "backing" .)
'in arrears' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for overdue that I've seen before include "Past the appointed date for payment" , "Behind schedule" , "after the time specified" , "Beyond the expected time" , "Not having arrived at the expected time" .)