Explosions seen this evening in sky -- a gunfight we suspect (3,6,5)

I believe the answer is:

guy fawkes night

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'explosions seen this evening' is the definition.
The definition suggests a singular noun which matches the answer.

'sky a gunfight we suspect' is the wordplay.
'suspect' indicates an anagram (a suspicious or unusual spelling).
'sky'+'a'+'gunfight'+'we'='skyagunfightwe'
'skyagunfightwe' anagrammed gives 'GUY FAWKES NIGHT'.

'in' acts as a link.

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I've seen this clue in The Telegraph.

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