List extender (2,2)
I believe the answer is:
et al
'list extender' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for et al that I've seen before include "'And others, to the old Romans (2,2)'" , "And others (abbrev.)" , "And the rest, to the old Romans" , "and everyone else)" , "Latin abbreviation meaning 'and others'" .)