Join together touring a region of South East England (5)
I believe the answer is:
weald
'region of south east england' is the definition.
'weald' can be an answer for 'region' (weald is a kind of region). I am unsure of the 'of south east england' bit.
'join together touring a' is the wordplay.
'join together' becomes 'weld' (I've seen this before).
'touring' means one lot of letters goes inside another (touring can mean going round).
'weld' enclosing 'a' is 'WEALD'.
Can you help me to learn more?
(Other definitions for weald that I've seen before include "Open or wooded country" , "Area of open or forested country" , "District between N. & S. Downs" , "The ___, area between the North and South Downs" , "Area of SE England" .)