Superior share might floor you (8)
I believe the answer is:
uppercut
'floor you' is the definition.
The definition suggests a singular noun which matches the answer.
'superior share' is the wordplay.
'superior' becomes 'upper' (eg an upper house in a parliament).
'share' becomes 'cut' (cut is a kind of share).
'upper'+'cut'='UPPERCUT'
'might' is the link.
Can you help me to learn more?
(Other definitions for uppercut that I've seen before include "Boxing punch delivered vertically" , "Swinging blow directed at an opponent's chin" , "Blow from fist to chin" , "A vertical punch to chin delivered by boxer" , "Part of boxer's repertoire" .)