Reagan Secretary of State (4)
I believe the answer is:
haig
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reagan secretary of state</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for haig that I've seen before include "British World War One field marshal" , "Douglas -, field marshal" , "WWI C-in-C" , "Earl -; British WW 1 commander-in-chief" .)