An abridged motif for stirring song (6)
I believe the answer is:
anthem
'stirring song' is the definition.
'anthem' can be an answer for 'song' (anthem is a kind of song). I am not certain of the 'stirring' bit.
'an abridged motif' is the wordplay.
'abridged' means to remove the last letter.
'motif' becomes 'theme' (synonyms).
'theme' with its last letter removed is 'them'.
'an'+'them'='ANTHEM'
'for' is the link.
Can you help me to learn more?
(Other definitions for anthem that I've seen before include "Song in praise of a nation" , "Internationale?" , "Song of praise or loyalty" , "National or religious song" , "air of patriotism?" .)