Duke is upset during break, getting inflamed (6,2)

'inflamed' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'duke is upset during break' is the wordplay.
'is upset' indicates anagramming the letters (I've seen 'are upset' mean this).
'during' means one lot of letters goes inside another.
'break' becomes 'stop' (both can mean to malfunction or stop working).
'duke' anagrammed gives 'kedu'.
'kedu' put within 'stop' is 'STOKED UP'.

'getting' acts as a link.

Can you help me to learn more?