Their names are forgotten, taking nighties off (8)

I believe the answer is:

thingies

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

'their names are forgotten' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'nighties off' is the wordplay.
'off' indicates an anagram.
'nighties' with letters rearranged gives 'THINGIES'.

'taking' is the link.

Can you help me to learn more?

(Another definition for thingies that I've seen is " What-d'you-call-'em".)

I've seen this clue in The Guardian.

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