Hair cleaner (7)
I believe the answer is:
shampoo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hair cleaner</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 shampoo that I've seen before include "16 21 [INDIAN IMPORT]" , "treat shock?" , "Liquid soap" , "Cleaning fluid" , "preparation for cleaning locks" .)