Hearts of men and nobles enlocked as one (2,4)
I believe the answer is:
en bloc
'as one' is the definition.
(French phrase meaning altogether)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for en bloc that I've seen before include "All together, en masse" , "Wholesale, as one unit" , "All together (French)" , "in wholesale fashion" , "All together - as a whole" .)