Hair cleanser (7)
I believe the answer is:
shampoo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hair cleanser</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 "Ooh, spam! (anag.)" , "Oh, so Pam uses it on her hair?" , "Soap for washing hair" , "clean" , "Hair-cleaner" .)