It's imported by "doppelganger" in German (6)

I believe the answer is:

ringer

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'it's' is the definition.
I can't tell whether this definition defines the answer.

'imported by doppelganger in german' is the wordplay.
'imported by' indicates the answer is hidden within the clue.
'RINGER' is hidden within 'doppelganger in german'.

Can you help me to learn more?

(Other definitions for ringer that I've seen before include "One is almost identical to another in the belfry" , "See 22" , "Campanologist's" , "Campanologist - if dead, double" , "Campanologist - spitting image" .)

I've seen this clue in The Independent.

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