Latin scores were made up by these cheats (6-7)
I believe the answer is:
double-crosses
'these cheats' is the definition.
(I've seen this before)
'latin scores were' is the wordplay.
I cannot really see how this works, but
'latin' could be 'l' and 'l' is found in the answer.
an anagram of 'scores' is 'ecross' which is within the answer.
This may be the basis of the clue (or it may be nonsense).
'made up by' is the link.
Can you help me to learn more?
(Another definition for double-crosses that I've seen is " Cheats".)