Willow (5)
'willow' is the definition.
(osier is a kind of willow)
This is all the clue.
(Other definitions for osier that I've seen before include "Wood" , "Salix" , "Basket-maker's willow" , "Basket-maker" , "Flexible twig of a willow tree" .)
'willow' is the definition.
(pussy willow is a kind of willow)
This is the entire clue.
(Other definitions for pussy that I've seen before include "Cat (colloq.)" , "Catkin tree" , "chap thought to be weak" , "Water down" , "Kitten" .)