A degree of decadence in port (4)

I believe the answer is:

aden

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'port' is the definition.
(port in Yemen)

'a degree of decadence' is the wordplay.
'ADEN' is hidden in amongst the letters.
But, I'm uncertain how this is indicated.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for aden that I've seen before include "Yemeni gulf" , "Main port of Yemen" , "somewhere on the Arabian peninsula" , "Strange Dane to be in the Yemen" , "Dean out in the seaport city" .)

I've seen this clue in the Evening Standard.

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