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' indicates the answer is hidden within the clue (I've seen 'resident of' mean this).
'GLEE' can be found hidden inside '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" .)