Speechless with anger when duke denied offence (7)
I believe the answer is:
umbrage
'offence' is the definition.
(I know that offence can be written as umbrage)
'speechless with anger when duke denied' is the wordplay.
I cannot quite understand how this works, but
'anger' could be 'rage' (rage is a kind of anger) and 'rage' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for umbrage that I've seen before include "Take this to feel offence" , "Resentment, offence" , "Feeling of anger caused by being offended" , "Take this to show offence" , "Take this to be offended" .)