"Full ... five, thy father lies" (The Tempest) (6)

I believe the answer is:

fathom

(Other definitions for fathom that I've seen before include "Understand (something) after much thought" , "Sea depth of six feet" , "Unit of depth - comprehend it" , "Sound" , "Six feet in depth; grasp" .)

I've seen this clue in The Irish Times.

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