A language and a quarter? (5)
I believe the answer is:
latin
I believe this clue is a double definition.
'a language' is the first definition.
(Latin is an example)
'a quarter?' is the second definition.
(I have seen 'A quarter' mean 'latin' so perhaps 'quarter' could also mean 'latin')
'and' is the link.
(Other definitions for latin that I've seen before include "Parent language of French,Romanian" , "A Romance language" , "a quarter of Parisians" , "Language of Cicero" , "Language of old Romans" .)