Rubbish left in public (6)
I believe the answer is:
litter
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rubbish left in public</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for litter that I've seen before include "mess around?" , "Brood of young born to an animal" , "Rubbish left in public places" , "Young dogs, perhaps" , "Bits of rubbish left lying about" .)