Dirty trick reported at the same time (9)
I believe the answer is:
meanwhile
'at the same time' is the definition.
(synonyms)
'dirty trick reported' is the wordplay.
'dirty' becomes 'mean' (synonyms).
'trick' becomes 'wile' (wiles are tricks or deceptions).
'reported' indicates a 'sounds like' (homophone) clue.
'wile' sounds like 'while'.
'mean'+'while'='MEANWHILE'
(Other definitions for meanwhile that I've seen before include "In the intervening time" , "On the other hand" , "in intervening period" , "For the moment" , "simultaneously" .)