Right in line, perhaps (4)
I believe the answer is:
lien
'right' is the definition.
(legal right)
'line perhaps' is the wordplay.
'perhaps' indicates an anagram.
'line' with letters rearranged gives 'LIEN'.
'in' acts as a link.
(Other definitions for lien that I've seen before include "Legal claim on the property of another" , "The right to take property if an obligation is not met" , "Right to keep property" , "The right to take property if an obligation is not discharged" , "Right to retain property until a debt is paid" .)