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 cannot see how they can define each other.
'reserve after cut repeatedly caging antelope' is the wordplay.
'reserve after cut' becomes 'ic' (I can't justify this - if you can you should believe this answer much more).
'repeatedly' shows that letters should be duplicated.
'caging' means one lot of letters goes inside another (I've seen this in other clues).
'antelope' becomes 'eland' (eland is a kind of antelope).
'ic' duplicated is 'icic'.
'icic' placed 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" .)