I must leave schools with German radio (8)
I believe the answer is:
transmit
'radio' is the definition.
(thesaurus)
'i must leave schools with german' is the wordplay.
'must leave' indicates named letters should be taken away.
'schools' becomes 'trains' (training is a kind of schooling).
'with german' becomes 'mit' ('with' in German).
'trains' with 'i' removed is 'trans'.
'trans'+'mit'='TRANSMIT'
(Other definitions for transmit that I've seen before include "Pass or hand on" , "Send from one to another, electronically say" , "Send - communicate" , "put out" , "Disseminate" .)