Points to procurator initially exercising large legal restriction (8)
I believe the answer is:
estoppel
'legal restriction' is the definition.
(type of legal restriction)
'points to procurator initially exercising large' is the wordplay.
'points' becomes 'es' (E is an example**).
'procurator' becomes 'pp' ('per procurationem' means done using a procurator).
'initially' indicates taking the first letters.
The first letters of 'exercising large' is 'el'.
'es'+'to'+'pp'+'el'='ESTOPPEL'
(Other definitions for estoppel that I've seen before include "Conclusive admission" , "Legal principle" , "bar" .)