Means of buying audio version of The Unbearable Lightness of Being? (10)
I believe the answer is:
chequebook
'audio version of the unbearable lightness of being?' is the definition.
I can't tell whether this defines the answer.
'means of buying' is the wordplay.
'means' becomes 'cheque' (I have seen 'Means of payment ' mean 'cheque' so perhaps 'means' could also mean 'cheque').
'of buying' becomes 'book' (I can't explain this - if you can you should give a lot more credence to this answer).
'cheque'+'book'='CHEQUEBOOK'
Can you help me to learn more?
(Other definitions for chequebook that I've seen before include "Buying rights to a news story" , "Practice of paying for often sordid stories" , "Bank facility" , "Bank account holder's item" , "funds may be released by it" .)