Bunch of hair (4)
'bunch of hair' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tuft that I've seen before include "Dog's lead" , "Handful of hair" , "Sort of undergrad" , "Bunch of threads or grass" , "Bunch of hair, feathers, grass etc" .)
(Other definitions for hank that I've seen before include "Skein (of wool, etc)" , "Ring for a sail" , "Henry - coil of rope, wool or yarn" , "Loop of yarn" , "Skein (of wool, hair)" .)