Hard knocks (4)
(Other definitions for raps that I've seen before include "Sprechgesang pop hits" , "Knocks sharply" , "'Knocks, on the door say (4)'" , "Cracks" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hard knocks</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 bops that I've seen before include "hits" , "Dances to pop" .)