Not mandatory to answer, OK? (8)

I believe the answer is:

passable

I believe this is a double definition.

'not mandatory to answer' is the first definition.
(able to be passed instead of answered)

'ok?' is the second definition.
(I've seen this before)

(Other definitions for passable that I've seen before include "All right" , "OK" , "Merely satisfactory" , "Barely adequate" , "examinations should be!" .)

I've seen this clue in The Times.

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