Crossword Genius

Perfectly correct in putting this pot on high heat (4,2)

Ross

I believe the answer is:

spot on

I'm a little stuck... Click here to teach me more about this clue!

'perfectly correct' is the definition.
'spot on' can be an answer for 'correct' (I've seen this before). I am unsure of the 'perfectly' bit.

'putting this pot on high heat' is the wordplay.
I cannot really see how this works, but
'on' is found in the answer.
'this pot' could be 'pot' and 'pot' is located in the answer.
A single letter 's' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

'in' acts as a link.

Can you help me to learn more?

(Other definitions for spot on that I've seen before include "Quite right" , "What the leading actor may have" , "Absolutely right" , "Precise" , "Totally true" .)

I've seen this clue in the Sydney Morning Herald.
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