Crossword Genius

Not compulsory (8)

Ross

I believe the answer is:

optional

'not compulsory' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for optional that I've seen before include "Elective, as you choose" , "'Elective, not obligatory (8)'" , "Platoon I join as a matter of choice" , "Open to choice - take your pick" , "Not mandatory" .)

I've seen this clue in the Evening Standard.
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