Safe part of Cape terrain (5)

I believe the answer is:

peter

'safe' is the definition.
(slang term for a safe)

'part of cape terrain' is the wordplay.
'part of' indicates a hidden word.
'PETER' is hidden in the letters of 'cape terrain'.

(Other definitions for peter that I've seen before include "In whist, play" , "- Pan, eternal youth" , "prison cell" , "and 16: Actor who played Hercule Poirot" , "Saint's name" .)

I've seen this clue in The Guardian.

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