Ancient region of Western Europe (4)
I believe the answer is:
gaul
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ancient region of western europe</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 gaul that I've seen before include "Ancient region of France/Belgium in Caesar's time" , "Asterix, for example" , "Caesar's name for old France" , "Name given for ancient France from Celtic times" , "old country" .)