The most common and most likely answer to this crossword clue is the 5 letter word HAULM
H
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M
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The straight part
We know that "Stalk" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stalk = haulm.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 HAULM mean?
HAULM noun- The stems of various cultivated plants, left after harvesting the crop to be used as animal litter or for thatching.
- An individual plant stem.
- Part of a harness; a hame.