It's beastly language that Björk uses, renouncing two independent clubs (5)
I believe the answer is:
eland
'language that bjork uses renouncing two independent clubs' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'it's beastly' is the wordplay.
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'beastly' becomes 'land' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'e'+'land'='ELAND'
Can you help me to learn more?
(Other definitions for eland that I've seen before include "Large African deer with short spiral horns" , "South African antelope" , "African mammal" , "African beast" , "Browser" .)