Characters opening teashop obtain yummy, sweet trifles (4)
I believe the answer is:
toys
'trifles' is the definition.
(I've seen this in another clue)
'characters opening teashop obtain yummy sweet' is the wordplay.
'characters opening' indicates taking the first letters (the characters which begin or open the words).
The initial letters of 'teashop obtain yummy sweet' is 'TOYS'.
(Other definitions for toys that I've seen before include "Film" , "Chihuahuas?" , "Children's playthings" , "dolls, for example" , "Trifles with playthings" .)