Get clean away with a failure (7)
I believe the answer is:
washout
'a failure' is the definition.
(I know that washout is a type of failure)
'get clean away' is the wordplay.
'get' is a charade indicator (letters next to each other).
'clean' becomes 'wash' (washing is a kind of cleaning).
'away' becomes 'out' (similar in meaning).
'wash' put next to 'out' is 'WASHOUT'.
'with' is the link.
(Other definitions for washout that I've seen before include "Cancelled test, for example" , "match abandoned due to rain?" , "A complete failure - too much rain" , "Cancelled event - utter failure" , "Flush" .)