Crossword Genius

Very small type found in shellfish (5)

Ross

I believe the answer is:

pearl

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

This could be a double definition.

'very small type' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'shellfish' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'found in' acts as a link.

Can you help me to learn more?

(Other definitions for pearl that I've seen before include "Lustrous globule prized as a gem" , "Gem; size of type" , "Object of great worth" , "Oyster growth" , "Much loved and valued person" .)

I've seen this clue in The Irish Independent.
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