Spirit in angel angelic! (4)
'spirit' is the definition.
(elan is a kind of spirit)
'in angel angelic' is the wordplay.
'in' says the answer is hidden in the clue.
'ELAN' is hidden in the letters of 'angel angelic'.
(Other definitions for elan that I've seen before include "Combination of style and vigour", "Stylish elegance", "spirit", "Dash, style", "Dash and enthusiasm.".)