It's equitable to a miss (4)
I believe the answer is:
mile
'a miss' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'it's equitable' is the wordplay.
I cannot quite understand how this works, but
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found within the answer.
The remaining letters 'mil' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Other definitions for mile that I've seen before include "'1,760 yards (4)'" , "1.61km" , "'A miss is as good as a ....'" , "Stretch of road" , "Imperial length" .)