Late extra, outstanding (7)
I believe the answer is:
overdue
'late' is the definition.
('overdue' can be similar in meaning to 'late')
'extra outstanding' is the wordplay.
'extra' becomes 'over'.
'outstanding' becomes 'due' (I've seen this before).
'over'+'due'='OVERDUE'
(Other definitions for overdue that I've seen before include "after the time specified" , "Late, outstanding like bill" , "(Of library books) late" , "Of payment, past the required date" , "unsettled" .)