Crossword Genius

Mollusc providing world of opportunities? (6)

Ross

I believe the answer is:

oyster

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

'mollusc' is the definition.
(I know that oyster is a type of bivalve)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for oyster that I've seen before include "Pearl-making mollusc" , "aphrodisiac?" , "World as place of opportunity" , "pale pink" , "Storey (anag)" .)

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.