Blazing with the oxygen injected at extreme temperature (5-3)
I believe the answer is:
white-hot
'blazing' is the definition.
(thesaurus)
'with the oxygen injected at extreme temperature' is the wordplay.
'with' means one lot of letters goes inside another.
'the oxygen' becomes 'O' (O is the chemical symbol for oxygen).
'injected at' becomes 'white' (I can't justify this - if you can you should believe this answer much more).
'extreme' suggests removing the centre.
'temperature' becomes 'heat' (heat is a kind of temperature).
'heat' with its centre taken out is 'ht'.
'white'+'ht'='whiteht'
'o' placed within 'whiteht' is 'WHITE-HOT'.
Can you help me to learn more?
(Another definition for white-hot that I've seen is " Glowing fiercely with heat".)