"Age of Aquarius" musical (4)

I believe the answer is:
hair
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">age of aquarius musical</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 hair that I've seen before include "Musical with nude scenes" , "Famous hirsute musical with song ` `Aquarius' ' (4)" , "Thread-like structure(s)" , "Threadlike growth" , "Penitent's shirt material" .)