Crossword Genius

Taciturn person spending his life in bed (6)

Ross

I believe the answer is:

oyster

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

This could be a double definition.

'taciturn person spending his' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'life in bed' is the second definition.
The definition and answer can be both animals as well as being singular nouns.
Maybe there's a link between them I don't understand?

Can you help me to learn more?

(Other definitions for oyster that I've seen before include "very uncommunicative person" , "Secretive person; bivalve" , "A pearl may grow in it" , "Storey (anag)" , "Bivalve that may nurture a pearl" .)

I've seen this clue in The Globe and Mail.
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