Crossword Genius

They are performed by one going east or west (5)

Ross

I believe the answer is:

solos

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'they' is the definition.
Both the answer and definition are plural nouns.
Perhaps they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for solos that I've seen before include "Pieces of music for one voice or instrument" , "Numbers" , "Passages for one player" , "Musical passages for one instrument" , "Unaccompanied parts" .)

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