Space in the chamber (4)
I believe the answer is:
room
This clue is a double definition.
'space' is the first definition.
(enough space or room to do something)
'the chamber' is the second definition.
(I've seen this before)
'in' is the link.
(Other definitions for room that I've seen before include "Adequate space" , "kitchen?" , "Space within a building" , "Chamber; scope" , "Space (for elbows?)" .)