Late up, along with others (2,2)
I believe the answer is:
et al
'along with others' is the definition.
(I've seen this before)
'late up' is the wordplay.
'up' says the letters should be written backwards (in down clue: letters go upwards).
'late' back-to-front is 'ET AL'.
(Other definitions for et al that I've seen before include "Latin notation - late for others" , "And others (abbrev.)" , "And the rest, to the old Romans" , "... and other people (or things) (abbr)" , "along with others" .)