Ill-advisedly sends tat obtained in airport (8)

I believe the answer is:

stansted

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'airport' is the definition.
(I've seen this before)

'ill-advisedly sends tat obtained' is the wordplay.
'sends tat' anagrams to 'STANSTED'.
But, I'm unsure how this is indicated.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for stansted that I've seen before include "Departure point" , "One of London's airports" , "Airport north of London" .)

I've seen this clue in The Irish Times.

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