Crossword clue: an herb (pilea pumila) of the nettle family, having a smooth, juicy, pellucid stem; -- called also clearweed.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
a plants of the genus Pilea having drooping green flower clusters and smooth translucent stems and leaves