Gun shop purchase (4)
I believe the answer is:
ammo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gun shop purchase</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 ammo that I've seen before include "that goes in magazine: ...?" , "What's fired from guns (abbr)" , "Shot" , "Bullet" , "rounds briefly" .)