Eager to leave zone after Jack gets suspicious (7)
I believe the answer is:
jealous
'suspicious' is the definition.
(thesaurus)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for jealous that I've seen before include "Green-eyed" , "Envious of another" , "Showing envious resentment" , "Envious, covetous" , "Green" .)