King, for example, is keeping in contact with realms (7)
I believe the answer is:
regions
'realms' is the definition.
(I know this)
'king for example is keeping in contact with' is the wordplay.
'king' becomes 'R' (abbreviation of Latin rex).
'for example' becomes 'e.g.' (short for 'exempli gratia', 'for example' in Latin).
'keeping' means one lot of letters goes inside another (some letters kept inside).
'in contact with' becomes 'on' (to be on something is to be touching it).
'is' enclosing 'on' is 'ions'.
'r'+'eg'+'ions'='REGIONS'
(Other definitions for regions that I've seen before include "patches" , "Domains" , "'Areas, locations (7)'" , "Extended areas" , "Parts of the country" .)