Tresses, locks (4)
I believe the answer is:
hair
I believe this is a double definition.
'tresses' is the first definition.
(I've seen this before)
'locks' is the second definition.
(locks can mean hair)
(Other definitions for hair that I've seen before include "Famous hirsute musical with song ` `Aquarius' ' (4)" , "Fuzz" , "Human head covering" , "Fur - mop" , "Outgrowth from the skin" .)