One to address people during settlement (9)
I believe the answer is:
agreement
'settlement' is the definition.
(thesaurus)
'one to address people during' is the wordplay.
'one' becomes 'a'.
'to address' becomes 'greet' (greeting is a kind of addressing).
'people' becomes 'men' (men can refer to humanity as a whole).
'during' is an insertion indicator.
'greet' placed around 'men' is 'greement'.
'a'+'greement'='AGREEMENT'
(Other definitions for agreement that I've seen before include "Union < matching" , "Conformity" , "Harmony, concurrence" , "match" , "concert" .)