Crossword Genius

Shocking — as a secret? (13)

Ross

I believe the answer is:

unmentionable

This clue is a double definition.

'shocking' is the first definition.
(too scandalous to be mentioned)

'as a secret?' is the second definition.
(a secret cannot be mentioned)

(Other definitions for unmentionable that I've seen before include "Taboo" , "Forbidden as a topic of conversation" , "Not fit to be referred to" .)

I've seen this clue in The Times.
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