Smash into pieces (7)
I believe the answer is:
shatter
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">smash into pieces</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 shatter that I've seen before include "Break into many bits" , "Support for broken arm" , "Threats (anag.)" , "wreck" , "Crack" .)