Greek character joins learner and others (2,2)
I believe the answer is:
et al
'and others' is the definition.
(I've seen this before)
'greek character joins learner' is the wordplay.
'greek character' becomes 'eta' (letter from the Greek alphabet).
'joins' says to put letters next to each other.
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'eta'+'l'='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)" , "and everyone else)" , "And others (abbrev.)" , "Latin notation meaning and others" .)