Consternation caused by vegetables I'd brought back (6)
I believe the answer is:
dismay
'consternation' is the definition.
(synonyms)
'vegetables i'd brought back' is the wordplay.
'vegetables' becomes 'yams' (yam is a kind of vegetable).
'brought back' says the letters should be written in reverse.
'yams'+'id'='yamsid'
'yamsid' back-to-front is 'DISMAY'.
'caused by' is the link.
(Other definitions for dismay that I've seen before include "Fill with apprehension" , "Feeling of despair in the face of obstacles" , "Appal" , "Sadden" , "unnerve" .)