Right member and a left (5)
I believe the answer is:
legal
'right' is the definition.
(legal right is a kind of right)
'member and a left' is the wordplay.
'member' becomes 'leg' (I've seen this before**).
'and' says to put letters next to each other.
'left' becomes 'l' (common abbreviation).
'leg'+'a'+'l'='LEGAL'
(Other definitions for legal that I've seen before include "Referring to the law" , "Authorized" , "OK as an immigrant?" , "Authorised" , "In accordance with statute" .)