Degree courses on English language (8)
I believe the answer is:
balinese
'language' is the definition.
(I have seen 'Foreign language' mean 'balinese' so perhaps 'language' could also mean 'balinese')
'degree courses on english' is the wordplay.
'degree' becomes 'BA' (Bachelor of Arts).
'courses' becomes 'lines' ('line' can be a synonym of 'course').
'on' says to put letters next to each other.
'english' becomes 'e' (abbreviation).
'ba'+'lines'+'e'='BALINESE'
(Other definitions for balinese that I've seen before include "Foreign language" , "Indonesian" , "policy needs external support" , "Asian language" , "Islanders" .)