Envoy, a German taking part as tourist (7)
I believe the answer is:
voyager
'tourist' is the definition.
(thesaurus)
'envoy a german taking part' is the wordplay.
'taking part' says the answer is hidden in the clue.
'VOYAGER' can be found hidden inside 'envoy a german'.
'as' acts as a link.
(Other definitions for voyager that I've seen before include "Seafarer" , "Traveller to a distant land" , "Sea or space traveller" , "Traveler to a distant land" , "Person making a journey on water or in space" .)