Impulsive times full of extremely enjoyable emotions (8)
I believe the answer is:
feelings
'emotions' is the definition.
(feelings are emotions)
'impulsive times full of extremely enjoyable' is the wordplay.
'impulsive times' becomes 'flings' (fling can mean an impulsive affair).
'full of' is an insertion indicator.
'extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'enjoyable' with its centre taken out is 'ee'.
'flings' placed around 'ee' is 'FEELINGS'.
(Other definitions for feelings that I've seen before include "Love, hate, sorrow etc." , "Emotions or sensations" .)