Privilege to receive current letter (9)
I believe the answer is:
character
'letter' is the definition.
(I've seen this before)
'privilege to receive current' is the wordplay.
'privilege' becomes 'charter' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to receive' means one lot of letters goes inside another.
'current' becomes 'ac' (alternating current).
'charter' placed around 'ac' is 'CHARACTER'.
Can you help me to learn more?
(Other definitions for character that I've seen before include "crank" , "Distinctive nature" , "eccentric individual" , "I, for example" , "case" .)