Silkworm's protection (6)
I believe the answer is:
cocoon
'silkworm's protection' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cocoon that I've seen before include "Protective cover of silkworms, etc" , "Protective covering around some animal eggs" , "Silky sheath around a chrysalis" , "Silken sheath" , "Envelop for protection" .)