Select old ones like this Nimrod's not once initially enjoyed (9)
I believe the answer is:
exclusive
'select' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for exclusive that I've seen before include "Catering for only the wealthy, not obtainable elsewhere" , "Not divided or shared with others" , "Select, high-class" , "catering for a few customers" , "article kept away from other rags" .)