Put the mockers on hill exercises before finish (7)
I believe the answer is:
torpedo
'put the mockers' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'hill exercises before finish' is the wordplay.
'hill' becomes 'tor' (tor is a kind of hill).
'exercises' becomes 'pe' (Physical Education class).
'before' is a charade indicator (letters next to each other).
'finish' becomes 'do'.
'tor'+'pe'+'do'='TORPEDO'
'on' acts as a link.
Can you help me to learn more?
(Other definitions for torpedo that I've seen before include "Sea-borne missile" , "Explosive underwater weapon" , "Submarine weaponry" , "Missile form a submarine" , "To wreck" .)