Crossword Genius

Not obligatory (8)

Ross

I believe the answer is:

optional

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not obligatory</span>' is the definition.<br/ ><span class="explanation-format__explanation">('optional' is the opposite to 'obligatory')</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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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