Delayed returning: also others (2,2)
I believe the answer is:
et al
'also others' is the definition.
('et al' means 'and other people')
'delayed returning' is the wordplay.
'delayed' becomes 'late' (running late).
'returning' shows that the letters should be reversed in order.
'late' reversed gives 'ET AL'.
(Other definitions for et al that I've seen before include "'And others, to the old Romans (2,2)'" , "... and other people (or things) (abbr)" , "Latin notation - late for others" , "And the rest (Lat. abbr.)" , "And the rest, to the old Romans" .)