Very hot situation: cubicle door finally blown (8)
I believe the answer is:
crucible
'very hot situation' is the definition.
(a crucible is for boiling things)
'cubicle door finally blown' is the wordplay.
'finally' indicates one should take the final letters.
'blown' indicates an anagram (to blow can mean to disrupt or scatter).
The last letter of 'door' is 'r'.
'cubicle'+'r'='cubicler'
'cubicler' anagrammed gives 'CRUCIBLE'.
(Other definitions for crucible that I've seen before include "severe test" , "Vessel for molten metal" , "Melting-pot" , "Vessel for melting metals" , "it gets very heated" .)