I used to know that song. The Clutha sometimes sang it live. I recall some of your missing line Jimmy: "the Billy Boys? and the San Toi (or Toy, another gang)". A guy called James? Patrick wrote a book called "A Glasgow Gang Remembered" c. 1970. (He was a scholar, not a gangster). Anyone got that?                                                               

It seems that an authoritative definition of the meaning of "Glasgow" is probably now beyond us. The "dear" bit does seem to be an invention.