Crossword Genius

Savage gunfight was key in commemorative evening (3,6,5)

Ross

I believe the answer is:

guy fawkes night

'commemorative evening' is the definition.
(evening commemorating the Gunpowder Plot)

'savage gunfight was key' is the wordplay.
'savage' is an anagram indicator (to savage can mean to attack or destroy).
'gunfight'+'was'+'key'='gunfightwaskey'
'gunfightwaskey' is an anagram of 'GUY FAWKES NIGHT'.

'in' acts as a link.

I've seen this clue in The Times.
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