Crossword Genius

Supply replenishes zany king, back to stoke tense situation (5-4)

Ross

I believe the answer is:

knife-edge

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

'tense situation' is the definition.
(I've seen this before)

'supply replenishes zany king back to stoke' is the wordplay.
I cannot really understand how this works, but
'supply' could be 'feed' (feeding is a kind of supplying) and 'feed' is located in the answer.
an anagram of 'king' is 'knig' which is present in the remaining letters.
A single letter 'e' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for knife-edge that I've seen is " precarious situation".)

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