Crossword Genius

Line up for walk (9)

Ross

I believe the answer is:

tightrope

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'line up' is the definition.
(line that's up in the air)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for tightrope that I've seen before include "Acrobat's walkway" , "Difficult thing to walk on" , "On which acrobats walk" , "An acrobat walks on this high above the ground" , "Entertaining line" .)

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