Cabbage white is under ripe bananas (6)

I believe the answer is:

pieris

I'm a little stuck... Click here to teach me more about this clue!

'cabbage white' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'is under ripe bananas' is the wordplay.
'under' says to put letters next to each other (below, in a down clue).
'bananas' is an anagram indicator (informal term for mad).
'ripe' is an anagram of 'pier'.
'is' after 'pier' is 'PIERIS'.

Can you help me to learn more?

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.