Language of Castro bore translating (5-5)
I believe the answer is:
serbo-croat
'language' is the definition.
(I've seen this before)
'castro bore translating' is the wordplay.
'translating' indicates an anagram (I've seen 'translated' mean this).
'castro'+'bore'='castrobore'
'castrobore' anagrammed gives 'SERBO-CROAT'.
'of' acts as a link.
(Other definitions for serbo-croat that I've seen before include "language" , "European" .)