The most common and most likely answer to this crossword clue is the 8 plus 8 letter word ELECTRIC LADYLAND
I've seen this crossword clue in The Guardian
E
L
E
C
T
R
I
C
L
A
D
Y
L
A
N
D
Buddy explains!
The straight part
We know that "LP by 22 across" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lp by 22 across = electric ladyland.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.