… because of fitting getting delayed (7)
I believe the answer is:
overdue
'delayed' is the definition.
(something overdue has been delayed)
'because of fitting getting' is the wordplay.
'because of' becomes 'over' (eg 'he's upset over it').
'fitting' becomes 'due' (both can mean appropriate).
'getting' means one lot of letters go next to another.
'over'+'due'='OVERDUE'
(Other definitions for overdue that I've seen before include "Later than the appointed time, as for bill payment" , "Not paid by the appropriate time" , "Late arriving" , "Belated" , "Past the ETA" .)