Darts starting point in Rochester (4)

I believe the answer is:

oche

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'darts starting point' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'in rochester' is the wordplay.
'in' indicates the answer is hidden within the clue.
'OCHE' is hidden in the letters of 'rochester'.

Can you help me to learn more?

(Other definitions for oche that I've seen before include "Darts playing line" , "Line from which a dart player throws" , "Behind which a darts player must stand" , "Dart-throwing line" , "Dart player's mark" .)

I've seen this clue in The Mirror.

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