Shells and bullets (4)
I believe the answer is:
ammo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">shells and bullets</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ammo that I've seen before include "Explosive devices" , "arms" , "Bullets, say, in short" , "Slugs perhaps" , "essential supplies for soldiers" .)