Greek in a garret (5)
I believe the answer is:
attic
This clue is a double definition.
'greek' is the first definition.
(Attic is an example)
'a garret' is the second definition.
('attic' can be a synonym of 'garret')
'in' acts as a link.
(Other definitions for attic that I've seen before include "top-flight accommodation" , "Classically elegant" , "Tacit (anag.)" , "Top storey" , "Classical" .)