Six royals and two Norsemen? (7)
I believe the answer is:
vikings
'two norsemen?' is the definition.
'Vikings' can be an answer for 'norsemen?' (historical Norse people). I am not certain of the 'two' bit.
'six royals' is the wordplay.
'six' becomes 'VI' (Roman numerals).
'royals' becomes 'kings' (I can't explain this - if you can you should give a lot more credence to this answer).
'vi'+'kings'='VIKINGS'
'and' is the link.
Can you help me to learn more?
(Other definitions for vikings that I've seen before include "Scandinavian adventurers who attacked Ireland" , "Scandinavian marauders" , "Norsemen" , "Invaders" .)