Crossword Genius

Before Ed joined one (4)

Ross

I believe the answer is:

unit

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'one' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for unit that I've seen before include "- - trust" , "Single undivided entity" , "Single manufactured item; military grouping" , "Single whole as part of a larger whole" , "Self-contained part" .)

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