Remove from auxiliary court (7)
I believe the answer is:
extract
'remove' is the definition.
(thesaurus)
'auxiliary court' is the wordplay.
'auxiliary' becomes 'extra' (I've seen this before).
'court' becomes 'ct'.
'extra'+'ct'='EXTRACT'
'from' acts as a link.
(Other definitions for extract that I've seen before include "concentrate" , "Derive, distil" , "essence" , "Passage selected from a larger work" , "Citation" .)