Crossword Genius

Not obligatory (8)

Ross

I believe the answer is:

optional

'not obligatory' is the definition.
('optional' is the opposite to 'obligatory')

This is all the clue.

(Other definitions for optional that I've seen before include "Too plain (anag.)" , "Elective, as you choose" , "Open to choice - take your pick" , "Platoon I join as a matter of choice" , "Available as a choice but not obligatory" .)

I've seen this clue in The Times.
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