It's been a while but I attempted a DT cryptic the other day. 
I got the gist of these but I was hoping for a more accurate answer if I may?
9. Across - Impropriety of popular Italian novelist breaking cylinder.    (9)               Answer = 'Indecorum'
                   I get the impropriety bit but not the rest.
3. Down -  Call to mind right English prayer. (9)
                   Answer = 'Recollect'
                   Not sure about the prayer bit in this one?
7. Down -  Worried about husband blocking an expressway. (8)
                   Answer = 'Autobahn'
                   I can see the 'H' for husband and the autobahn
                   'expressway' but worried?  
15. Across - English writer married of acquiring wife in US state (8)
                     Answer = 'Delaware'
                     Well I can see Delaware is the US state but that is about  
                     it.
Thank you.