Piano keys (7)
I believe the answer is:
ivories
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">piano keys</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 ivories that I've seen before include "Informal piano keys - tickle them" , "Piano keys; teeth (slang)" , "Tinkle them on the piano" , "Joanna's bits to tickle" , "champers" .)