Chat in party, taking number from nurse (9)
I believe the answer is:
discourse
'chat' is the definition.
'party taking number from nurse' is the wordplay.
'party' becomes 'disco' (I've seen this before).
'taking' is a charade indicator (letters next to each other).
'number' becomes 'n' (n can represent any number).
'from' indicates named letters should be taken away.
'nurse' with 'n' removed is 'urse'.
'disco'+'urse'='DISCOURSE'
'in' acts as a link.
(Other definitions for discourse that I've seen before include "Communication verbally" , "(Formal) talk" , "Written or spoken communication" , "To hold a conversation" , "Speech - conversation" .)