Feeling of ecstasy comes with travelling (7)
I believe the answer is:
emotion
'feeling' is the definition.
(emotion is a kind of feeling)
'ecstasy comes with travelling' is the wordplay.
'ecstasy' becomes 'E' (informal term for the drug).
'comes with' means one lot of letters go next to another.
'travelling' becomes 'motion' (travelling is moving or motion).
'e'+'motion'='EMOTION'
'of' is the link.
(Other definitions for emotion that I've seen before include "Strong feeling as of love or hate" , "Feeling like love or fear" , "Strong feeling, love or jealousy" , "Feeling, say love or hate" , "eg Anger, fear, joy" .)