Make a show, when freshening up decor (7)
I believe the answer is:
produce
'make a show' is the definition.
(as in to produce a theatre show)
'when freshening up decor' is the wordplay.
'when freshening' indicates anagramming the letters (the order of letters is refreshed).
'up'+'decor'='updecor'
'updecor' anagrammed gives 'PRODUCE'.
(Other definitions for produce that I've seen before include "Make, create" , "Create, manufacture" , "Bear" , "Make, manufacture" , "Bring forth or yield" .)