Person demanding wild animal should be locked up in court (8)
I believe the answer is:
claimant
'person' is the definition.
(claimant is a kind of person)
'wild animal should be locked up in court' is the wordplay.
I cannot really understand how this works, but
an anagram of 'animal' is 'laiman' which is present in the answer.
'court' could be 'ct' (abbreviation used in road names) and 'ct' is found in the leftover letters.
No letters remain.
This explanation may well be incorrect...
'demanding' is the link.
Can you help me to learn more?
(Other definitions for claimant that I've seen before include "One demanding a right or title" , "One making an assertion" , "Pretender" , "Litigant" , "Person taking legal action" .)