Jealous of horrible souvenir redhead rejected (7)
I believe the answer is:
envious
'jealous' is the definition.
(I know that jealous can be written as envious)
'horrible souvenir redhead rejected' is the wordplay.
'horrible' indicates anagramming the letters.
'redhead' becomes 'r' (head letter of 'red').
'rejected' indicates named letters should be taken away.
'souvenir' with 'r' taken away is 'souveni'.
'souveni' is an anagram of 'ENVIOUS'.
'of' acts as a link.
(Other definitions for envious that I've seen before include "Covetous, jealous" , "Mildly jealous" , "Begrudging another's fortune" , "Grudging of others" , "Green-eyed" .)