Promise formally (6)
I believe the answer is:
pledge
(Other definitions for pledge that I've seen before include "Give one's word" , "make toast" , "Bond" , "Solemn undertaking" , "Promise, word of honour" .)
I believe the answer is:
pledge
(Other definitions for pledge that I've seen before include "Give one's word" , "make toast" , "Bond" , "Solemn undertaking" , "Promise, word of honour" .)