In substance, quite satisfied (7)
I believe the answer is:
content
'satisfied' is the definition.
(similar in meaning)
'in substance quite' is the wordplay.
I cannot really see how this works, but
'substance' could be 'te' (Te is an example) and 'te' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for content that I've seen before include "Elements" , "Satisfied; volume" , "Satisfied, happy enough" , "state of peaceful happiness" , "Gist" .)