Greek character joins learner and other people (2,2)
I believe the answer is:
et al
'and other people' is the definition.
(abbreviation for 'et alia' Latin for 'and others')
'greek character joins learner' is the wordplay.
'greek character' becomes 'eta' (letter from the Greek alphabet).
'joins' means one lot of letters go next to another.
'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 (abbr)" , "along with others" , "And others (abbrev.)" , "And the rest, to the old Romans" , "Latin notation - late for others" .)