Team player writing extra note about party (10)
I believe the answer is:
footballer
'team player' is the definition.
'footballer' can be an answer for 'player' (thesaurus). I am not certain of the 'team' bit.
'extra note about party' is the wordplay.
'extra note' becomes 'footer' (I am not sure about this - if you are sure you should believe this answer much more).
'about' means one lot of letters goes inside another.
'party' becomes 'ball' (ball is a kind of party).
'footer' placed around 'ball' is 'FOOTBALLER'.
'writing' is the link.
Can you help me to learn more?
(Other definitions for footballer that I've seen before include "left-winger, perhaps" , "Back (or forward?)" , "Sportsman" , "Kenny Dalglish?" .)