The most common and most likely answer to this crossword clue is the 7 letter word SORGHUM
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More clues leading to the result SORGHUM
Buddy explains!
The straight part
We know that "Tropical grass" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tropical grass = sorghum.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 SORGHUM mean?
SORGHUM noun- A cereal, Sorghum bicolor (syn. Sorghum vulgare) the grains of which are used to make flour and as cattle feed.
- Sorghum syrup.