Old red line some players must not cross? (4)
I believe the answer is:
oche
'line some players must not cross?' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'old red' is the wordplay.
'old' becomes 'o' (abbreviation).
'red' becomes 'Che' (as in Che Guevara, a communist or 'red').
'o'+'che'='OCHE'
Can you help me to learn more?
(Other definitions for oche that I've seen before include "Line where dart thrower stands" , "line of throwers?" , "Line not to be crossed" , "The mark at darts" , "front line" .)