Because established at Epping? (6)

I believe the answer is:

forest

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'at epping?' is the definition.
I can't judge whether this definition defines the answer.

'because established' is the wordplay.
'because' becomes 'for' (I've seen this in another clue).
'established' becomes 'est' (abbreviation).
'for'+'est'='FOREST'

Can you help me to learn more?

(Other definitions for forest that I've seen before include "Sherwood or Pine, say" , "See 15" , "Grow more rigid" , "Thick growth of trees" , "Large, densely-wooded area" .)

I've seen this clue in the Evening Standard.

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