Right to compare with deposed king? (4)
I believe the answer is:
lien
'right' is the definition.
(legal right)
'compare with deposed king?' is the wordplay.
'compare' becomes 'liken' (synonyms).
'with deposed' suggests deleting specific letters.
'king?' becomes 'K' (abbreviation for king in chess).
'liken' with 'k' taken out is 'LIEN'.
'to' is the link.
(Other definitions for lien that I've seen before include "Right to another's property, if an obligation is not discharged" , "Legal right to detain property" , "The right to take property if an obligation is not met" , "Right to keep property" , "Legal claim on the property of another" .)