Joint camp launch in chaos, so many changes to be made here (7,8)
I believe the answer is:
clapham junction
'many changes to be made here' is the definition.
(station where many travellers change trains)
'joint camp launch in chaos' is the wordplay.
'in chaos' indicates an anagram.
'joint'+'camp'+'launch'='jointcamplaunch'
'jointcamplaunch' is an anagram of 'CLAPHAM JUNCTION'.
'so' is the link.
(Other definitions for clapham junction that I've seen before include "Stop (for 6) [TRAINS UP]" , "Popular stop" .)