The most common and most likely answer to this crossword clue is the 5 plus 4 letter word WATER LILY
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Buddy explains!
The straight part
We know that "Pond plant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pond plant = water lily.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does WATER LILY mean?
WATER LILY noun- Any of various members of the Nymphaeaceae family that are tuberous plants, rooted in soil with leaves (lily pads) and flowers floating on the water surface.
- Species of genus Nymphoides, the fringed water lily and similar plants.
- Species of genus Nelumbo.