Style and vigour a large antelope mostly shows (4)
I believe the answer is:
elan
'style and vigour' is the definition.
(I've seen this before)
'a large antelope mostly shows' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is found in the answer.
'large' could be 'l' (eg in clothes sizes) and 'l' is found within the answer.
A single letter 'e' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for elan that I've seen before include "Verve and dash" , "Dash in France" , "Bounce" , "Combination of style and vigour" , "Stylish enthusiasm" .)