Right to remain head of negotiations (4)
I believe the answer is:
lien
'right' is the definition.
(I've seen this before)
'remain head of negotiations' is the wordplay.
'remain' becomes 'lie'.
'head of' suggests taking the first letters.
The first letter of 'negotiations' is 'n'.
'lie'+'n'='LIEN'
'to' is the link.
(Other definitions for lien that I've seen before include "Right to retain property until a debt is paid" , "Right to keep property" , "Legal right to detain property" , "Legal claim on the property of another" , "Legal claim on Nile" .)