Crossword Genius

Suit oneself (5)

Ross

I believe the answer is:

dress

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'suit' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for dress that I've seen before include "formal attire" , "deck" , "Clothing - groom" , "Straighten the line" , "Cultivate < tidy" .)

I've seen this clue in The Globe and Mail.
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