Song Al composed as a means to drum up custom (6)

I believe the answer is:

slogan

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'a means to drum up custom' is the definition.
I can't judge whether this defines the answer.

'song al composed' is the wordplay.
'composed' is an anagram indicator.
'song'+'al'='songal'
'songal' with letters rearranged gives 'SLOGAN'.

'as' acts as a link.

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(Other definitions for slogan that I've seen before include "Word or phrase adopted as motto" , "Rallying cry" , "Shibboleth" , "'Motto, watchword (6)'" , "Short catchy phrase used in advertising" .)

I've seen this clue in The Globe and Mail.

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