Crossword Genius

Unknown barge travels into capital (6)

Ross

I believe the answer is:

zagreb

'capital' is the definition.
(capital of Croatia)

'unknown barge travels' is the wordplay.
'unknown' becomes 'z' (algebra).
'travels' is an anagram indicator.
'barge' is an anagram of 'agreb'.
'z'+'agreb'='ZAGREB'

'into' is the link.

(Other definitions for zagreb that I've seen before include "Croatia's capital city" , "Croatian city" , "European capital" , "on River Sava" , "European city" .)

I've seen this clue in The Guardian.
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