Reserve, after cut, repeatedly caging antelope from northern country (9)
I believe the answer is:
icelandic
'northern country' is the definition.
Although both the answer and definition are adjectives, I can't understand how they can define each other.
'reserve after cut repeatedly caging antelope' is the wordplay.
'reserve after cut' becomes 'ic' (I can't explain this - if you can you should give a lot more credence to this answer).
'repeatedly' shows that letters should be duplicated.
'caging' indicates putting letters inside (I've seen this in other clues).
'antelope' becomes 'eland' (eland is a kind of antelope).
'ic' doubled is 'icic'.
'icic' going around 'eland' is 'ICELANDIC'.
'from' is the link.
Can you help me to learn more?
(Other definitions for icelandic that I've seen before include "Language of people of Reykjavik" , "Eg, native to Reykjavik" , "As European" , "in island republic" , "Like many sagas" .)