Prosecutes us wrongly for shortage of dues (4)
I believe the answer is:
sues
'prosecutes' is the definition.
(I've seen this before)
'us wrongly for shortage of dues' is the wordplay.
'wrongly' is an anagram indicator.
'for' means one lot of letters go next to another.
'shortage of dues' becomes 'es' (I can't explain this - if you can you should give a lot more credence to this answer).
'us' with letters rearranged gives 'su'.
'su'+'es'='SUES'
Can you help me to learn more?
(Other definitions for sues that I've seen before include "Institutes legal proceedings against" , "Takes to court" , "Takes legal action against" , "Prosecutes" , "Takes a case against" .)