English spar, showing wit (6)
I believe the answer is:
'wit' is the definition.
(I've seen this before)
'english spar' is the wordplay.
'english' becomes 'E' (abbreviation).
'spar' becomes 'sprit' (sprit is a kind of spar).
'showing' acts as a link.
(Other definitions for esprit that I've seen before include "Group morale is . . . . . . de corps", "... de corps, team spirit", "Sprightliness", "Liveliness of mind or spirit", "Lively wit".)