Substitute duty nurse working around Germany (10)
I believe the answer is:
understudy
'substitute' is the definition.
(thesaurus)
'duty nurse working around germany' is the wordplay.
'working' is an anagram indicator.
'around' means one lot of letters goes inside another.
'germany' becomes 'd' (vehicle registration code for Deutschland).
'duty'+'nurse'='dutynurse'
'dutynurse' anagrammed gives 'understuy'.
'understuy' going around 'd' is 'UNDERSTUDY'.
(Other definitions for understudy that I've seen before include "One prepared to take over from leading actor" , "emergency role" , "reserve?" , "one covers part" , "one's hoping to get on" .)