Crossword Genius

Mature sweeper changes sides (5)

Ross

I believe the answer is:

bloom

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'mature' is the definition.
(thesaurus)

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

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(Other definitions for bloom that I've seen before include "Orlando" , "Do very well" , "Blossom, flower" , "Flush" , "look good" .)

I've seen this clue in The Independent.
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