With edges trimmed, season mince and blend (9)
I believe the answer is:
integrate
'blend' is the definition.
(I've seen this in another clue)
'with edges trimmed season mince' is the wordplay.
'with edges trimmed' means to look at the middle letters (letters at the edges are removed).
'season' becomes 'winter' (winter is a season).
'mince' becomes 'grate' (I can't justify this - if you can you should give a lot more credence to this answer).
The central letters of 'winter' are 'inte'.
'inte'+'grate'='INTEGRATE'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for integrate that I've seen before include "unify" , "Join" , "Get together" , "Incorporate into the whole" , "Combine into a whole, unite" .)