Answer: offa

AnswerCrossword Clue
OFFA...'s Dyke, Wales
OFFAFalling-log link
OFFAEasy as falling ... log
OFFA"Like water .. duck's back"
OFFATeutonic legendary hero.
OFFAAnglian hero in "Beowulf."
OFFA" . . . falling ... log"
OFFAAnglo-Saxon king
OFFAMedieval king
OFFAEighth-century Mercian king
OFFA"...... short pier!"
OFFA" ... long walk ... short pier!"
OFFAEasy as falling -- log
OFFAComing ... slump