Some breakfast is more impetuous (6)
I believe the answer is:
rasher
'some breakfast is more impetuous' is the definition.
I can't judge whether this defines the answer.
'some breakfast is more impetuous' is the wordplay.
'some' says to take the centre.
'breakfast' becomes 'bran' (I have seen 'Healthy breakfast ' mean 'bran' so perhaps 'breakfast' could also mean 'bran').
'is more impetuous' becomes 'sher' (I can't justify this - if you can you should believe this answer much more).
The middle of 'bran' is 'ra'.
'ra'+'sher'='RASHER'
Can you help me to learn more?
(Other definitions for rasher that I've seen before include "Thin strip of bacon" , "Not so safe" , "type of food" , "Thin slice of bacon" , "Less cautious" .)