Metric unit I record in score that’s backed up (8)
I believe the answer is:
kilogram
'metric' is the definition.
(I know that metric weight unit is a type of metric)
'unit i record in score that's backed up' is the wordplay.
I cannot really see how this works, but
'unit' could be 'kilo' (kilo is a kind of unit) and 'kilo' is located in the answer.
'i' could be 'a' and 'a' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for kilogram that I've seen before include "Approximately 2.2 lbs" , "Approximately two point two zero five pounds" , "mass in Paris" , "Unit of mass" , "Metric mass" .)