Dangerous to shave bottom close to heater in living room (7)
I believe the answer is:
parlour
'living room' is the definition.
(synonyms)
'dangerous to shave bottom close to' is the wordplay.
'dangerous' becomes 'parlous' (similar in meaning).
'to shave bottom' means to remove the last letter (the bottom letter is removed or shaven).
'close to' becomes 'r' (I am not sure about this - if you are sure you should believe this answer much more).
'parlous' with its final letter removed is 'parlou'.
'parlou'+'r'='PARLOUR'
'heater in' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
(Other definitions for parlour that I've seen before include "Room for receiving guests in a monastery" , "Living room - where farmers milk cows?" , "where cows are milked!" , "Confident, daring" , "Room in public house" .)