Greek and German in cave (6)
I believe the answer is:
grotto
'cave' is the definition.
(I've seen this before)
'greek and german' is the wordplay.
'greek' becomes 'gr'.
'and' says to put letters next to each other.
'german' becomes 'otto' (I've seen this before).
'gr'+'otto'='GROTTO'
'in' acts as a link.
(Other definitions for grotto that I've seen before include "Ornamental cave" , "Santa's cave" , "(Imitation) cave" , "fancy underground area" , "It's left on Dec 24 by Santa and his reindeer" .)