Take up help with the French court in regional language (7)
I believe the answer is:
dialect
'regional language' is the definition.
(I've seen this in another clue)
'take up help with the french court' is the wordplay.
'take up' is a reversal indicator (I've seen 'taken up' mean this).
'help' becomes 'aid' (synonyms).
'with' is a charade indicator (letters next to each other).
'the french' becomes 'le' ('the' in French).
'court' becomes 'ct' (abbreviation used in road names).
'aid' written backwards gives 'dia'.
'dia'+'le'+'ct'='DIALECT'
'in' is the link.
(Other definitions for dialect that I've seen before include "Manner of speaking" , "talk from the regions" , "Patois" , "Local lingo" , "Talk of the district" .)