Crossword Genius

Optional (9)

Ross

I believe the answer is:

voluntary

'optional' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for voluntary that I've seen before include "Given of one's own free will" , "Undertaken by free choice" , "Without compulsion" , "Organist may attempt it" , "Done without payment" .)

I've seen this clue in the Sydney Morning Herald.
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