Hill has a knockout punch initially (3)
I believe the answer is:
kop
'hill' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I don't see?
'a knockout punch initially' is the wordplay.
'a knockout' becomes 'KO' (abbreviation).
'initially' suggests taking the first letters.
The initial letter of 'punch' is 'p'.
'ko'+'p'='KOP'
'has' is the link.
Can you help me to learn more?
(Other definitions for kop that I've seen before include "football terraces" , "Football stand" , "High football terrace" .)