Crossword Genius

Why funkiest gag went wrong, and there were fireworks (3,6,5)

Ross

I believe the answer is:

guy fawkes night

I'm a little stuck... Click here to teach me more about this clue!

'wrong and there were fireworks' is the definition.
I can't tell whether this definition defines the answer.

'why funkiest gag went' is the wordplay.
'went' indicates anagramming the letters ('go' can mean move).
'why'+'funkiest'+'gag'='whyfunkiestgag'
'whyfunkiestgag' is an anagram of 'GUY FAWKES NIGHT'.

Can you help me to learn more?

I've seen this clue in The Daily Express.
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