Taciturn person spending his life in bed (6)
I believe the answer is:
oyster
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" .)