Resident in jungle expressing delight (4)
I believe the answer is:
glee
'delight' is the definition.
(glee can mean great joy)
'resident in jungle expressing' is the wordplay.
'resident' says the answer is hidden in the clue (I've seen 'resident of' mean this).
'GLEE' is hidden within 'in jungle expressing'.
(Other definitions for glee that I've seen before include "Jewelled headband" , "Elation" , "Great delight; part song" , "Lively or triumphant joy" , "Impish enjoyment" .)