Published books about defrocked nun (3)

I believe the answer is:

out

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'published' is the definition.
(I've seen this in other clues)

'books about defrocked nun' is the wordplay.
'OUT' is hidden within the letters.
However, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for out that I've seen before include "impossible" , "Not favoured" , "excluded" , "SECOND PART OF 14" , "sleeping" .)

I've seen this clue in The Independent.

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