Unusual feature of night clue (3,5)

I believe the answer is:

odd thing

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

'unusual feature of night clue' is the definition.
I can't tell whether this defines the answer.

'unusual feature of night' is the wordplay.
I cannot quite understand how this works, but
'unusual' could be 'odd' (similar in meaning) and 'odd' is located in the answer.
an anagram of 'night' is 'thing' which is within the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Guardian.

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