A seed, upset, gets mollified (5)
I believe the answer is:
eased
'mollified' is the definition.
(I've seen this in another clue)
'a seed upset' is the wordplay.
'upset' is an anagram indicator.
'a'+'seed'='aseed'
'aseed' is an anagram of 'EASED'.
'gets' acts as a link.
(Other definitions for eased that I've seen before include "Moved carefully" , "Alleviated" , "Made less difficult, relieved from anxiety" , "Made less hard" , "Calmed" .)