Show salesman envy (9)
I believe the answer is:
represent
'show' is the definition.
(I know that show is a more specific form of the action represent)
'salesman envy' is the wordplay.
'salesman' becomes 'rep' (sales representative).
'envy' becomes 'resent' (I've seen this in another clue).
'rep'+'resent'='REPRESENT'
(Other definitions for represent that I've seen before include "Illustrate" , "Explain" , "Mean" , "Act for" , "Portray" .)