Crossword Genius

Anglo-Saxon king (with a dyke?) (4)

Ross

I believe the answer is:

offa

(Other definitions for offa that I've seen before include "He created barrier" , "Mercian king, built dyke" , "8th-century Mercian king" , "Old English dyke builder" , "Mercian dykemaker" .)

I've seen this clue in The Guardian.
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