Realm of Rex and Dominic? (7)
I believe the answer is:
kingdom
'realm' is the definition.
(I've seen this before)
'of rex and dominic?' is the wordplay.
I cannot really see how this works, but
'of' could be 'o' and 'o' is located in the answer.
'rex' could be 'k' and 'k' is present in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is found in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for kingdom that I've seen before include "big territory?" , "All the animals" , "State ruled by monarch" , "Country with royal head of state" , "Domain of a monarch" .)