Well-known fertiliser for flowers (6)

I believe the answer is:

pollen

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

'well-known fertiliser' is the definition.
'pollen' can be an answer for 'fertiliser' (pollen fertilises plants). I am not sure about the 'well-known' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for pollen that I've seen before include "Fine powder discharged from a plant" , "Powdery substance given off by flowers" , "Allergen from some plants" , "Dust-like powder from some plants" , "Flower powder" .)

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.