Call taken by eastern court in local language (7)
I believe the answer is:
dialect
'local language' is the definition.
(local dialect)
'call taken by eastern court' is the wordplay.
'call' becomes 'dial' (as in making a phone call).
'taken by' says to put letters next to each other.
'eastern' becomes 'e'.
'court' becomes 'ct' (abbreviation used in road names).
'dial'+'e'+'ct'='DIALECT'
'in' acts as a link.
(Other definitions for dialect that I've seen before include "Manner of speaking" , "Local way of speaking" , "Material damage" , "Talk of the district" , "Local speech variant" .)