Jealous feeling (4)
I believe the answer is:
envy
'jealous feeling' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for envy that I've seen before include "Desire to possess another's attributes etc" , "Jealous longing" , "Feeling of grudging admiration" , "Jealous emotion - deadly sin" , "8 [BEGRUDGE]" .)