Nurse that is meeting son's agreements (8)
I believe the answer is:
treaties
'agreements' is the definition.
(treaty is a kind of agreement)
'nurse that is meeting son's' is the wordplay.
'nurse' becomes 'treat' (I've seen this before**).
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'meeting' means one lot of letters go next to another.
'treat'+'ie'+'s'='TREATIES'
(Other definitions for treaties that I've seen before include "Treatise on international agreements" , "Written agreements between states" , "Accords" , "Treatise about pacts" , "Rome and Versailles, for example" .)