Soldier; fish (9)
I believe the answer is:
grenadier
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">soldier</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(historical term for a grenade-carrying soldier)</span><br/ ><br/ >'<span class="explanation-format__original">fish</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(grenadier is a kind of fish)</span><br/ ><br/ ></span>
(Other definitions for grenadier that I've seen before include "guard" , "Re-reading for the deep-sea fish" , "Soldier - in red gear (anag)" , "A household infantryman" , "Infantryman - in red gear (anag)" .)