Abridged song a source of inspiration (10,3)
I believe the answer is:
compressed air
'a source of inspiration' is the definition.
(eg scuba divers breathe or inspire compressed air)
'abridged song' is the wordplay.
'abridged' becomes 'compressed' (I've seen this before).
'song' becomes 'air' (I've seen this before).
'compressed'+'air'='COMPRESSED AIR'
(Other definitions for compressed air that I've seen before include "Tyre filler" , "Something provided on garage forecourt" , "that's piped" , "Filler for tyres" .)