Crossword Genius

Person building union of two generations? (5)

Ross

I believe the answer is:

mason

'person building' is the definition.
(stonemason)

I don't understand how the remainder of the clue works.

(Other definitions for mason that I've seen before include "US comedian" , "Construction industry employee" , "one in construction" , "One works with stone or brick" , "Builder in stone" .)

I've seen this clue in The Times.
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