Crossword Genius

Tree Berliners could walk under? (6)

Ross

I believe the answer is:

linden

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'tree' is the definition.
(linden tree is a kind of tree)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for linden that I've seen before include "One twigged" , "Lime tree" , "Tree with Lea - also called 8" , "Unter den ------, iconic boulevard in Berlin" , "type of tree" .)

I've seen this clue in the Evening Standard.
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