Christmas Eve was such a quiet night (6)

I believe the answer is:

silent

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'quiet night' is the definition.
'silent' can be an answer for 'quiet' (I've seen this before). I am not sure about the 'night' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for silent that I've seen before include "unable to speak?" , "Making no noise" , "Strange and astonishing thing" , "Listen, being speechless after 10 across" , "Lacking sound" .)

I've seen this clue in The Guardian.

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