Cancelled event with a yell (7)
I believe the answer is:
washout
'cancelled event' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'with a yell' is the wordplay.
'with' becomes 'w' (abbreviation).
'yell' becomes 'shout' ('shout' can be a synonym of 'yell').
'w'+'a'+'shout'='WASHOUT'
Can you help me to learn more?
(Other definitions for washout that I've seen before include "Disappointing failure" , "Flush" , "Cancelled event - utter failure" , "A complete failure - rained off? (4-3)" , "match abandoned due to rain?" .)