A letter about election addict (7)
I believe the answer is:
devotee
'addict' is the definition.
(thesaurus)
'a letter about election' is the wordplay.
'a letter' becomes 'dee' (I've seen this in another clue).
'about' means one lot of letters goes inside another.
'election' becomes 'vote' (I can't justify this - if you can you should give a lot more credence to this answer).
'dee' going around 'vote' is 'DEVOTEE'.
Can you help me to learn more?
(Other definitions for devotee that I've seen before include "Disciple" , "Big fan" , "One strongly interested in something" , "An enthusiastic admirer and supporter" , "Fanatic" .)