Popular account: English royal abdicated over a breach (8)
I believe the answer is:
invasion
'breach' is the definition.
(thesaurus)
'popular account english royal abdicated over a' is the wordplay.
I cannot really understand how this works, but
'popular' could be 'in' ('in' can mean trendy) and 'in' is found within the answer.
'over' could be 'on' (physically on top of) and 'on' is located in the answer.
'a' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for invasion that I've seen before include "Encroachment by an army" , "Entry by force by an army" , "Encroachment by enemy" , "Unwelcome intrusion" , "Hostile incursion" .)