Superior piece of boxing? (8)
I believe the answer is:
uppercut
'boxing?' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'superior piece' is the wordplay.
'superior' becomes 'upper' (eg an upper house in a parliament).
'piece' becomes 'cut' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'upper'+'cut'='UPPERCUT'
'of' is the link.
Can you help me to learn more?
(Other definitions for uppercut that I've seen before include "A vertical punch to chin delivered by boxer" , "Swinging blow in boxing" , "Punch delivered vertically to chin" , "Part of boxer's repertoire" , "one must take it on the chin" .)