The headword is presumably quoted from somewhere. There are possibilities in several genres, the likeliest perhaps Isocrates 8.15 (a passage quoted by Dionysius of Halicarnassus in his treatise on that author); but see also e.g. Antiphanes fr. 76 Kock, now 77 K.-A.
For adverbial makra/n, in the gloss, see LSJ s.v.