Big name in hardware stores (3)
I believe the answer is:
ace
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">big name in hardware stores</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 ace that I've seen before include "single > club > champion" , "Unreturnable serve" , "reason for point of no return" , "Dab hand" , "Possibly a diamond" .)