Porter possibly catches university man jostling ex-students (7)
I believe the answer is:
alumnae
'students' is the definition.
(alumna is a kind of student)
'porter possibly catches university man jostling' is the wordplay.
'porter possibly' becomes 'ale' (porter is a kind of ale).
'catches' indicates putting letters inside.
'university' becomes 'U' (abbreviation for university).
'jostling' is an anagram indicator (letters move or jostle around).
'u'+'man'='uman'
'uman' anagrammed gives 'umna'.
'ale' enclosing 'umna' is 'ALUMNAE'.
'ex' is the link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for alumnae that I've seen before include "Former female pupils" , "Former students" , "Women who have studied" , "Graduates of a college" .)