Lush local choir improvised no end (9)
I believe the answer is:
alcoholic
'lush' is the definition.
(I know that lush can be written as alcoholic)
'local choir improvised no end' is the wordplay.
I cannot really understand how this works, but
'no' could be 'o' (resembles 0 - 'no' can mean 'zero') and 'o' is located in the answer.
'choir' could be 'ch' (abbreviation) and 'ch' is located in the remaining letters.
This explanation may well be incorrect...
(Other definitions for alcoholic that I've seen before include "One is addicted to liquor" , "needing AA assistance?" , "Over-tippling" , "One taking Jag frequently" , "Persistent drunkard" .)