Practice piano piece
I believe the answer is:
etude
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">practice piano piece</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 etude that I've seen before include "short musical piece" , "Testing musical composition" , "Chopin study" , "bit of practice" , "(Musical) study" .)