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Put the mockers on hill exercises before finish (7)

Ross

I believe the answer is:

torpedo

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'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" .)

I've seen this clue in The Telegraph.
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