Haunt KGB hub, meeting old Chinese leader? (4)

I believe the answer is:

deng

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

'chinese leader?' is the definition.
(I've seen this before)

'haunt kgb hub meeting old' is the wordplay.
I cannot really see how this works, but
'haunt' could be 'den' (I've seen this in another clue) and 'den' is located in the answer.
A single letter 'g' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for deng that I've seen is " Chinese leader".)

I've seen this clue in the Sydney Morning Herald.

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