Afterwards find a trainee on edge (7)
I believe the answer is:
lateral
'edge' is the definition.
(thesaurus)
'afterwards find a trainee' is the wordplay.
'afterwards' becomes 'later' (synonyms).
'find' is a charade indicator (letters next to each other).
'trainee' becomes 'l'.
'later'+'a'+'l'='LATERAL'
'on' acts as a link.
(Other definitions for lateral that I've seen before include "Possibly right" , "Edgeways" , "One type of thinking" , "Towards the side" , "Relating to the side" .)