Line that can't be crossed when firing arrows (4)
I believe the answer is:
oche
'line' is the definition.
(I've seen this before)
'can't be crossed when firing arrows' is the wordplay.
I cannot really understand how this works, but
'when' could be 'e' (I've seen this in other clues) and 'e' is located in the answer.
The remaining letters 'och' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'that' is the link.
Can you help me to learn more?
(Other definitions for oche that I've seen before include "The mark at darts" , "Line from which darts are thrown" , "Line from which a dart player throws" , "front line" , "Line where dart thrower stands" .)