A. a crook who works for a boss. a low level mobster or henchmen usually old and experienced.
B. Used in England for meaning someone who is old and especially ugly known to carry canes. for waving at ppl and hitting them.
A. See that crony over there, he's gonna come over here with that golf club and make a hole in one on your head unless u pay me now.
B: That old crony was so mad she waved his cane in my face and told me to fuck off...Well i took her cane and went upside her head.