A place of one's own that's hot, in the South of France (5)
I believe the answer is:
niche
'a place of one's own' is the definition.
(I've seen this in another clue)
'hot in the south of france' is the wordplay.
'hot' indicates an anagram (letters heated up or stimulated into a new order).
'the south of france' becomes 'che' (I am not sure about this - if you are sure you should believe this answer much more).
'in' with letters rearranged gives 'ni'.
'ni'+'che'='NICHE'
'that's' is the link.
Can you help me to learn more?
(Other definitions for niche that I've seen before include "Suitable position (in market, life etc)" , "ideal position" , "Suitable spot" , "Recess; place in life" , "Position well suited to the occupier" .)