Information linked to the German grammatical category (6)
I believe the answer is:
gender
'grammatical category' is the definition.
(gender is a kind of grammatical category)
'information linked to the german' is the wordplay.
'information' becomes 'gen' (gen can informally mean information).
'linked to' says to put letters next to each other.
'the german' becomes 'der' ('the' in German).
'gen'+'der'='GENDER'
(Other definitions for gender that I've seen before include "Man or woman" , "Male or female state" , "Eg, male" , "What divides males and females" , "Masculine, feminine or neuter" .)