Happy with what's in edition (9)
I believe the answer is:
contented
'happy' is the definition.
(associated in meaning)
'what's in edition' is the wordplay.
I cannot quite understand how this works, but
'edition' could be 'ed' (abbreviation) and 'ed' is present in the answer.
The remaining letters 'content' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'with' is the link.
Can you help me to learn more?
(Other definitions for contented that I've seen before include "Feeling satisfied" , "Not decent (anag) - cheerful" , "Satisfied with things as they are" , "'Satisfied, relaxed and happy (9)'" .)