Song inspiring devotion ultimately ruled (5)
I believe the answer is:
lined
'ruled' is the definition.
(I've seen this in another clue)
'song inspiring devotion ultimately' is the wordplay.
'song' becomes 'lied' (type of German song).
'inspiring' means one lot of letters goes inside another.
'ultimately' suggests the final letters.
The last letter of 'devotion' is 'n'.
'lied' enclosing 'n' is 'LINED'.
(Other definitions for lined that I've seen before include "Strengthened" , "Went along with" , "Ruled (paper); careworn (face)" , "Ruled - wrinkled" , "pockets may be so filled?" .)