Hill's a bit of a slick operator (3)
I believe the answer is:
kop
'hill's' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?
'a bit of a slick operator' is the wordplay.
'a bit of' indicates the answer is hidden within the clue.
'KOP' is hidden in the letters of 'slick operator'.
Can you help me to learn more?
(Other definitions for kop that I've seen before include "High football terrace" , "football terraces" , "Football stand" .)