Crossword clue: a bony scale of a reptile or fish; a large horny scale on the leg of a bird, or on the belly of a snake.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
large bony or horny plate as on an armadillo or turtle or the underside of a snake