Greek meets German in cave (6)
I believe the answer is:
grotto
'cave' is the definition.
(grotto is a kind of cave)
'greek meets german' is the wordplay.
'greek' becomes 'gr' (abbreviation for Greek).
'meets' is a charade indicator (letters next to each other).
'german' becomes 'otto' (common German name).
'gr'+'otto'='GROTTO'
'in' is the link.
(Other definitions for grotto that I've seen before include "fancy underground area" , "Small picturesque cave" , "Artificially or naturally ornamented cave" , "A picturesque cave as in Lourdes (6)" , "Ornamental cave" .)