Dog's dinner-time report? (7)
I believe the answer is:
message
'report?' is the definition.
(report is a kind of message)
'dog's dinner-time' is the wordplay.
'dog's dinner' becomes 'mess' (I've seen this before).
'time' becomes 'age' (an age is a period of time).
'mess'+'age'='MESSAGE'
(Other definitions for message that I've seen before include "The medium is the - (McLuhan)" , "Spoken or written communication" , "Errand" , "Missive" , "Verbal or written communication" .)