I'm sure its not "a stave and a chain" - In fact, I've just looked him up in Mister Jelly Roll by Alan Lomax. Quote : "Stavin Chain, to whom Morton compared himself, lived off women. Hero of a long rambling ballad, known all through the Southwest, Stavin Chain's prowess was sexual". Jelly Roll claimed he got the name Wining Boy from a habit of making up new bottles of wine from leftovers at Hilma Burt's mansion on the corner of Basin Street and Custom House, where he played piano. However Johnny St Cyr (banjo player with Louis Armstrong's Hot Five) said it was Winding Boy - "means a fellow that makes good jazz with the women".
Cheers
Ray