Anchorite (6)
I believe the answer is:
hermit
'anchorite' is the definition.
(synonyms)
This is all the clue.
(Other definitions for hermit that I've seen before include "Eremite" , "Ascetic who leads an isolated life" , "Person or crab living in solitude" , "One who lives in solitude, like kind of crab" , "Solitary person, anchorite" .)