Boxing film featuring a programme of music popular in rural USA (10)
I believe the answer is:
rockabilly
'music popular in rural usa' is the definition.
I can't tell whether this defines the answer.
'boxing film featuring a programme' is the wordplay.
'boxing film' becomes 'rocky' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'featuring' indicates putting letters inside.
'programme' becomes 'bill' (bill is a kind of programme).
'a'+'bill'='abill'
'rocky' placed around 'abill' is 'ROCKABILLY'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for rockabilly that I've seen before include "notes of the 1950s" , "Type of music" .)