Supply replenishes zany king, back to stoke tense situation (5-4)
I believe the answer is:
knife-edge
'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".)