1) Exclusively Saxon word 2) Exclusively Anglo word 3) Lengthwise 4) Lengthwise, old-style 5) Word with Anglo-Saxon origins 6) Word of purely Anglo origin Found on https://www.crosswordclues.com/clue/endlong
End'long` adverb & preposition [ Confer Along .] Lengthwise; along. [ Archaic] « The doors were all of adamants eterne, I-clenched overthwart and endelong With iron tough.» Chaucer. « He pricketh endelong the large space.» Chaucer. «... Found on http://www.encyclo.co.uk/webster/E/37