æf-þanc
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.
æf-þanc
&c. AddÆfþancan invidia, An. Ox. 8, 161: Angl. xiii. 33, 157. Gif hwylc yfeldǽde man þurh ǽnigne æfþancan óþerne begaleþ, Lch. i. 190, 9. Sé ðe lǽrð sunu his on æfþuncan (in zelum) hé ásent feónd he that teacheth his son grieveth the enemy (Ecclus. 30, 3), Scint. 176, 12. Ðá wræc hé his æfþancas on his feóndum, Guth. 14, 4.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.