Lacking contact with others (7)
I believe the answer is:
insular
'lacking contact with others' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for insular that I've seen before include "Surrounded by water - narrow - prejudiced" , "Parochial" , "Narrowly restricted in outlook or scope" , "Blinkered" , "Lacking contact with others" .)