Who's making space for a gallery? (8)
I believe the answer is:
showroom
'gallery?' is the definition.
(thesaurus)
'who's making space' is the wordplay.
'making' is an anagram indicator.
'space' becomes 'room' (enough space or room to do something).
'whos' with letters rearranged gives 'show'.
'show'+'room'='SHOWROOM'
'for a' is the link.
(Other definitions for showroom that I've seen before include "sales area" , "Scene for displaying" , "Where eg cars for sale are displayed" , "Area for the display of merchandise" , "commercial premises" .)