Happy following reporter's accurate account (5-2)
I believe the answer is:
write-up
'account' is the definition.
(I know that account can be written as write up)
'happy following reporter's accurate' is the wordplay.
'happy' becomes 'up' (I've seen this in other clues).
'following' says to put letters next to each other.
'reporter's' indicates a 'sounds like' (homophone) clue (report can mean to speak something aloud).
'accurate' becomes 'right' (similar in meaning).
'right' sounds like 'write'.
'up' after 'write' is 'WRITE-UP'.
(Other definitions for write-up that I've seen before include "Document (one's results)" , "Report (of an event)" , "Pure wit (anag.)" , "Report, account" , "Describe fully" .)