Somehow impound E in place frequented by drug addicts (5,3)

I believe the answer is:

opium den

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'place frequented by drug addicts' is the definition.
I can't tell whether this defines the answer.

'somehow impound e in' is the wordplay.
'somehow' indicates anagramming the letters.
'in' is an insertion indicator.
'impound' anagrammed gives 'opiumdn'.
'opiumdn' placed around 'e' is 'OPIUM-DEN'.

Can you help me to learn more?

(Other definitions for opium den that I've seen before include "place for addicts" , "Place to buy and smoke dope" , "smoke-filled room" , "Place to take drugs" .)

I've seen this clue in The Telegraph.

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