The most common and most likely answer to this crossword clue is the 6 letter word MADDER
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The straight part
We know that "Plant/more nuts" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case plant/more nuts = madder.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 MADDER mean?
MADDER noun- A herbaceous plant, Rubia tinctorum, native to Asia, cultivated for a red-purple dye (alizarin) obtained from the root.
- The root of the plant, used as a medicine or a dye.
- A dye made from the plant.
- A deep reddish purple colour, like that of the dye.
- Of a deep reddish purple colour, like that of the dye.
- Insane; crazy, mentally deranged.
- (chiefly US; informal in UK) Angry, annoyed.
- Bizarre; incredible.
- Wildly confused or excited.
- Extremely foolish or unwise; irrational; imprudent.
- (usually with for or about) Extremely enthusiastic about; crazy about; infatuated with; overcome with desire for.
- (of animals) Abnormally ferocious or furious; or, rabid, affected with rabies.
- (chiefly Northeastern US) Intensifier, signifies an abundance or high quality of a thing; very, much or many.
- (of a compass needle) Having impaired polarity.
- A communal drinking vessel used in Gaelic times for drinking mead. It had squared sides and one drank from a corner. Also, a trophy in this shape.