Crossword Genius

Idiosyncrasy of returning book unopened (6)

Ross

I believe the answer is:

foible

'idiosyncrasy' is the definition.
(synonyms)

'of returning book unopened' is the wordplay.
'returning' says the letters should be written in reverse.
'book' becomes 'bible' (bible is a kind of book).
'unopened' means to remove the first letter.
'of' reversed gives 'fo'.
'bible' with its initial letter taken away is 'ible'.
'fo'+'ible'='FOIBLE'

(Other definitions for foible that I've seen before include "Quirk" , "weakness" , "Harmless peculiarity or mannerism" , "'Mannerism, idiosyncrasy (6)'" , "Harmless peculiarity in person's character" .)

I've seen this clue in The Times.
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