An indication that one has to ratify a contract? (4)
I believe the answer is:
sign
This could be a double definition.
'an indication that one' is the first definition.
'sign' can be an answer for 'an indication' (I've seen this before). I am unsure of the remainder of the definition.
'ratify a contract?' is the second definition.
(as in signing a contract)
'has to' is the link.
Can you help me to learn more?
(Other definitions for sign that I've seen before include "Public notice; portent" , "Public notice; Leo, say" , "Traffic control - to write one's name" , "Omen or indication" , "Endorse" .)