Record list involved English letter (7)
I believe the answer is:
epistle
'letter' is the definition.
(I know that letter can be written as epistle)
'record list involved english' is the wordplay.
'record' becomes 'EP' (abbreviation for extended play record).
'involved' is an anagram indicator (involved can mean confusing or complex).
'english' becomes 'E' (abbreviation).
'list' anagrammed gives 'istl'.
'ep'+'istl'+'e'='EPISTLE'
(Other definitions for epistle that I've seen before include "A letter from St Paul" , "screed" , "a for instance" , "may read this" , "Writing" .)