A legal right to get expert (6)
I believe the answer is:
adroit
'expert' is the definition.
(I've seen this before)
'a legal right' is the wordplay.
'legal right' becomes 'droit' (historical term for a legal right).
'a'+'droit'='ADROIT'
'to get' is the link.
(Other definitions for adroit that I've seen before include "Skilful or ingenious" , "Dextrous" , "Deft and skilful" , "Dexterous, artful" , "skill" .)