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Frank’s back from trip, one spent in former East Germany (8)

Ross

I believe the answer is:

postmark

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'frank's' is the definition.
(synonyms)

I can't explain the remainder of the clue.

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(Other definitions for postmark that I've seen before include "Stamp franking" , "It is stamped on envelope" , "Letter franking" , "It shows date and time of mailing" , "Stamp cancellation" .)

I've seen this clue in The Times.
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