Laid-back court accepts English as a form of language (7)
I believe the answer is:
dialect
'a form of language' is the definition.
(I know that dialect is a type of language variety)
'laid-back court accepts english' is the wordplay.
'back' says the letters should be written in reverse.
'court' becomes 'ct' (abbreviation used in road names).
'accepts' means one lot of letters goes inside another.
'english' becomes 'e' (abbreviation).
'laid' back-to-front is 'dial'.
'dial'+'ct'='dialct'
'dialct' going around 'e' is 'DIALECT'.
'as' acts as a link.
(Other definitions for dialect that I've seen before include "Regional version of a language" , "Regional language form" , "Patois" , "Local way of speaking" , "Local language version" .)