Lives decribed initially by science-fiction writer (6)
I believe the answer is:
dwells
'lives' is the definition.
(to dwell somewhere is to live there)
'decribed initially by science-fiction writer' is the wordplay.
'initially' indicates taking the first letters.
'by' means one lot of letters go next to another.
'science-fiction writer' becomes 'wells' (herbert george wells).
The initial letter of 'decribed' is 'd'.
'd'+'wells'='DWELLS'
(Other definitions for dwells that I've seen before include "Lives in, inhabits" , "pauses" , "Establishes oneself" , "Lodges or resides" .)