Really upset about travel metaphor, perhaps (8)
I believe the answer is:
allegory
'metaphor perhaps' is the definition.
'really upset about travel' is the wordplay.
'upset' indicates an anagram.
'about' indicates putting letters inside.
'travel' becomes 'go' ('go' can be a synonym of 'travel'**).
'really' is an anagram of 'allery'.
'allery' going around 'go' is 'ALLEGORY'.
(Other definitions for allegory that I've seen before include "Improving story" , "Moral tale" , "Symbolic work" , "Myth" , "tale with hidden meaning" .)