Broadcast Ella Fitzgerald? (7)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

A cryptic hint supports the main definition. Ella (following on from a name-check at 2ac yesterday) was famous for scat, defined by Collins as a type of jazz singing characterized by improvised vocal sounds instead of words. I can’t find any support for SCATTER as a noun with reference to this so it’s a play on words and doesn’t qualify as a double definition. I love many types of jazz but I can’t stand scat.