Crisis point returning as liquid in well includes fuel (5-4)
I believe the answer is:
knife-edge
'crisis point' is the definition.
(both can mean a tense moment)
'returning as liquid in well includes fuel' is the wordplay.
'returning' is a reversal indicator.
'as' becomes 'eg' (I've seen this in other clues).
'liquid in well' becomes 'ink' (as in an inkwell).
'includes' is an insertion indicator.
'fuel' becomes 'feed' (as in fuelling or feeding a fire).
'eg'+'ink'='egink'
'egink' written backwards gives 'knige'.
'knige' placed around 'feed' is 'KNIFE-EDGE'.
(Another definition for knife-edge that I've seen is " precarious situation".)