Swiss spa duplicated in Germany (5)
I believe the answer is:
baden
'swiss spa' is the definition.
The definition suggests a singular noun which matches the answer.
'duplicated in germany' is the wordplay.
I cannot really see how this works, but
'germany' could be 'de' (standard two letter abbreviation - Deutschland) and 'de' is found within the answer.
The remaining letters 'ban' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for baden that I've seen before include "region of Germany" , "Powell's partner" .)