A relatively showy display of pussy willow? (6)
I believe the answer is:
catkin
'a relatively showy display' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'pussy willow?' is the wordplay.
'pussy' becomes 'cat' (I've seen this in other clues).
'willow?' becomes 'kin' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cat'+'kin'='CATKIN'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for catkin that I've seen before include "Willow or hazel flower spike" , "Willow or hazel tuft" , "Flower of hazel, birch etc" , "Ament -- on the hazel tree" , "one up a tree?" .)