Person temporarily replacing another sculpture? (6)
I believe the answer is:
relief
I believe this is a double definition.
'person temporarily replacing another' is the first definition.
(someone brought in to provide relief)
'sculpture?' is the second definition.
(relief is a kind of sculpture)
(Other definitions for relief that I've seen before include "Help or easement" , "Lightening up of something" , "Alleviation or help" , "help for needy countries" , "Stand-in" .)