Legal details of right in case of short measure ... (5,5)
I believe the answer is:
small print
'legal details' is the definition.
'small print' can be an answer for 'details' (small print is the details of a contract). I am not sure about the 'legal' bit.
'right in case of short measure' is the wordplay.
I cannot really understand how this works, but
'right' could be 'r' (common abbreviation) and 'r' is present in the answer.
'in' is within the answer.
'short' could be 'small' (associated in meaning) and 'small' is located in the answer.
'measure' could be 't' (T is an example) and 't' is found in the answer.
A single letter 'p' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'of' is the link.
Can you help me to learn more?
(Other definitions for small print that I've seen before include "Be careful to read this" , "Obscure terms" , "A trap for the unwary consumer" , "Words often ignored" , "Inconspicuous part of agreement" .)