Follow Dravidian language, but heart isn't in it (4)
I believe the answer is:
tail
'follow' is the definition.
(thesaurus)
'dravidian language but heart isn't in it' is the wordplay.
'dravidian language' becomes 'tamil' (Tamil is an example).
'but heart isn't in it' means to remove the middle letters.
'tamil' with its centre removed is 'TAIL'.
(Other definitions for tail that I've seen before include "Last, rear, part" , "Follow; end part" , "Follow closely - taper (off)" , "Shadow" , "Comet's luminous trail" .)