They run when broken (4)
I believe the answer is:
eggs
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">they run when broken</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 eggs that I've seen before include "__ Benedict" , "Incites - farm produce" , "Reproductive bodies" , "Breakfast items" , "Bombs or mines (slang)" .)