German submarines (1-5)
I believe the answer is:
u-boats
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">german submarines</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 u-boats that I've seen before include "Submersible warships" , "German submarines of second World War" , "German submarines in WW2" , "Submersible ships of WW2" , "German subs" .)