The most common and most likely answer to this crossword clue is the 13 plus 4 plus 5 letter word HOWÂ THEÂ OTHER HALF LIVES
I've seen this crossword clue in The Guardian
H
O
W
Â
T
H
E
Â
O
T
H
E
R
H
A
L
F
L
I
V
E
S
Buddy explains!
The straight part
We know that "on easy street, comparatively" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case on easy street, comparatively = how the other half lives.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.