ge-saca
This might be just a supplemental entry adding to an entry in the Main Volume.
Related §§ in Wright's OE Grammar:
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
ge-saca
Add: One who is in conflict with another. 1. in a general sense, an opponent, adversary p sum wer wunne on þǽre hengestan hatunge his gesacan (adversarii sui), Gr. D. 158, 26. 2. where a case is tried, an accuser Him wæs leaf seald þæt he moste him scyldan on andweardnesse his gesacena (-ona, v. l.) (praesentibus accusatoribus) . . . wæs cýðed þæt hys wrégend and his gesacan (accusatores eius) lease wið hine syredon, Bd. 5, 19 ; Sch. 668, 1-2. [Cf. ga-sachio in Salic law, Grm. R. A. 855.]
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.