Crossword Genius

Line for throwing in East End ball game (4)

Ross

I believe the answer is:

oche

I'm a little stuck... Click here to teach me more about this clue!

'line for throwing' is the definition.
(line where darts players stand)

'east end ball game' is the wordplay.
I cannot quite understand how this works, but
'east' could be 'e' (synonyms) and 'e' is found in the answer.
'ball' could be 'o' (letter resembling a ball) and 'o' is located in the answer.
The remaining letters 'ch' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'in' is the link.

Can you help me to learn more?

(Other definitions for oche that I've seen before include "Line not to be crossed" , "Darts playing line" , "Line from which darts are thrown" , "Missile launchers stand behind this" , "Line of 25 [ARROEWS]" .)

I've seen this clue in The Everyman puzzle in The Observer.
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