Times when things appear obscure? (6)

I believe the answer is:

nights

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

'times' is the definition.
(I know this)

'things appear obscure?' is the wordplay.
'things' can be anagrammed to 'NIGHTS'.
But, I am unsure how the anagram is indicated.

'when' acts as a link.

Can you help me to learn more?

(Other definitions for nights that I've seen before include "Times between days" , "See 1" , "Periods after sunset" , "Times of darkness" , "Times after sunset" .)

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