Mother back with Heather in the country (7)
I believe the answer is:
america
'country' is the definition.
(America is an example)
'mother back with heather' is the wordplay.
'mother' becomes 'ma' (ma is a kind of mother).
'back' is a reversal indicator.
'with' means one lot of letters go next to another.
'heather' becomes 'erica' (I've seen this before).
'ma' backwards is 'am'.
'am'+'erica'='AMERICA'
'in the' is the link.
(Other definitions for america that I've seen before include "huge landmass" , "United States" , "West Side Story song" , "The USA" , "Continent of the Western Hemisphere" .)