Tess and I change places (5)
I believe the answer is:
sites
'places' is the definition.
(a site is a place or location)
'tess and i change' is the wordplay.
'and' says to put letters next to each other.
'change' indicates an anagram.
'tess' after 'i' is 'itess'.
'itess' with letters rearranged gives 'SITES'.
(Other definitions for sites that I've seen before include "Locates" , "internet locations" , "Locations or positions, as for building" , "Is set among building locations" , "places" .)