Noble opposed old king initially in secluded place (4)
I believe the answer is:
nook
'secluded place' is the definition.
(I've seen this before)
'noble opposed old king initially' is the wordplay.
'initially' suggests taking the first letters.
The first letters of 'noble opposed old king' is 'NOOK'.
'in' is the link.
(Other definitions for nook that I've seen before include "Interior angle formed where two walls meet" , "Sheltered corner" , "Secluded corner" , "Comfortable corner" , "Quiet corner" .)