1) Decay in fruit 2) Decayed spot in fruit 3) Disease of overripe fruit 4) Fruit blemish 5) Fruit decay 6) Fruit rot 7) Overripe fruit problem Found on https://www.crosswordclues.com/clue/blet
Blet intransitive verb [ imperfect & past participle Bletted ; present participle & verbal noun Bletting .] To decay internally when overripe; -- said of fruit. Found on http://www.encyclo.co.uk/webster/B/65
Blet noun [ French blet , blette , adjective , soft from over ripeness.] A form of decay in fruit which is overripe. Found on http://www.encyclo.co.uk/webster/B/65