Cowboy hat (7)
I believe the answer is:
stetson
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cowboy hat</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for stetson that I've seen before include "Hat, for Texan oil magnate, say" , "Hat with broad brim and high crown" , "Capital investment" , "Man's hat with wide brim and high crown" , "No tests (anag.)" .)