
1) Margaret Thatcher epithet 2) Thatcher of England, to many 3) Thatcher sobriquet
Found on
https://www.crosswordclues.com/clue/iron-lady

Iron Lady is a nickname that has frequently been used to describe female heads of government around the world. The term describes a `strong willed` woman. The iron metaphor was most famously applied to Margaret Thatcher, and was coined by Captain Yuri Gavrilov in 1976 in the Soviet newspaper Red Star, for her staunch opposition to the Soviet Uni.....
Found on
http://en.wikipedia.org/wiki/Iron_Lady
No exact match found.