Couch test fail in eastern England (6)

I believe the answer is:

settee

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'couch' is the definition.
(settee is a kind of couch)

'test fail in eastern england' is the wordplay.
'fail' indicates an anagram (letters go wrong or fail).
'in eastern' becomes 'e' (I am not sure about the 'in' bit.).
'england' becomes 'E' (short for England).
'test' is an anagram of 'sett'.
'sett'+'e'+'e'='SETTEE'

Can you help me to learn more?

(Other definitions for settee that I've seen before include "Piece of furniture" , "two-seater?" , "Item of furniture" , "Get a seat" , "A long couch without arm-rests" .)

I've seen this clue in The Mirror.

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