Languish in love? Get a teacher (8)
I believe the answer is:
vegetate
'languish' is the definition.
(thesaurus)
'in love? get a teacher' is the wordplay.
'in' says the answer is hidden in the clue.
'VEGETATE' can be found hidden inside 'love get a teacher'.
(Other definitions for vegetate that I've seen before include "Live a dull inactive life" , "Do very little" , "Live uneventful life, stagnate" , "appears to be inert" , "Lead a dull and inactive life" .)