More's ideal land in which to live (6)
I believe the answer is:
reside
'to live' is the definition.
(I know that reside is a more specific form of dwell)
'more's ideal land in' is the wordplay.
'in' indicates a hidden word.
'RESIDE' is hidden within 'mores ideal land'.
'which' acts as a link.
(Other definitions for reside that I've seen before include "Live (in a place)" , "'Live, dwell (6)'" , "Inhabit" , "Dwell permanently" , "Dwell - settle" .)