Even sell paint with panache! (4)
I believe the answer is:
elan
'panache' is the definition.
(I know that panache can be written as elan)
'even sell paint' is the wordplay.
'even' means one should take alternating letters (letters in even-numbered positions are used).
'sell'+'paint'='sellpaint'
The alternate letters of 'sellpaint' are 'ELAN'.
'with' is the link.
(Other definitions for elan that I've seen before include "French vivacity" , "Impressive and energetic style" , "spirit" , "Dash in Paris" , "Impetuosity - style" .)