Unfenced coast is haven of peace (5)

I believe the answer is:

oasis

'haven of peace' is the definition.

'unfenced coast is' is the wordplay.
'unfenced' says to take the centre (remove the letters which fence in the word).
The central letters of 'coast' are 'oas'.
'oas'+'is'='OASIS'

(Other definitions for oasis that I've seen before include "Fertile area in desert" , "Green area in desert" , "Feature of desert" , "Peaceful area away from trouble" , "Place of peace" .)

I've seen this clue in The Independent.

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