Crossword Genius

Dirty old book consulted in audition (7)

Ross

I believe the answer is:

obscene

I'm a little stuck... Click here to teach me more about this clue!

'dirty' is the definition.
(similar in meaning)

'old book consulted in audition' is the wordplay.
I cannot quite understand how this works, but
'old' could be 'o' (common abbreviation eg in OE for Old English) and 'o' is found within the answer.
'book' could be 'b' (abbreviation for book) and 'b' is found in the answer.
The remaining letters 'scene' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for obscene that I've seen before include "not decent" , "One's CBE (anag)" , "Morally offensive, disgusting" , "Disgusting, repugnant" , "Prurient" .)

I've seen this clue in The Telegraph.
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