On mobile phone, approach house (5)
I believe the answer is:
manor
'house' is the definition.
(manor is a kind of house)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for manor that I've seen before include "Landed estate" , "lord's home" , "Roman (anag.)" , "Police district (slang)" , "home territory" .)