Sing about free ride, with intro from Stevie Nicks (9)

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

SHOP (as a verb = sing about = slang for betray to the authorities) + LIFT (as in “do you want a lift home?” = a free ride in someone else’s car) + introductory letter from S [tevie]. Nick, as a verb = slang for steal; shoplift = steal from a shop.