Part of upsetting dilemma editing what someone using their head thought (4)
I believe the answer is:
idea
'thought' is the definition.
('idea' can be a synonym of 'thought')
'part of upsetting dilemma editing what' is the wordplay.
'upsetting' is a reversal indicator.
'part of' says the answer is hidden in the clue.
'aedi' is hidden within 'dilemma editing what'.
'aedi' in reverse letter order is 'IDEA'.
'someone using their head' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for idea that I've seen before include "Theory" , "Mental impression" , "Product of the mind" , "Notion, concept" , "Plato's Form is" .)