One case or another outside burrow (8)
I believe the answer is:
cassette
'one case' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'another outside burrow' is the wordplay.
'another' becomes 'case' (I can't explain this - if you can you should give a lot more credence to this answer).
'outside' indicates putting letters inside (some letters go outside others).
'burrow' becomes 'sett' (I've seen this before).
'case' going around 'sett' is 'CASSETTE'.
'or' acts as a link.
Can you help me to learn more?
(Other definitions for cassette that I've seen before include "recording device" , "Music player" , "something from old-fashioned language laboratory?" , "Container to go into tape deck" , "Music tape" .)