Examples from the Web for sidelight
A callous and utterly botched effort, but even if just a sidelight to this execution, it fits the execution like a favorite glove.
As a(nother) sidelight, it's clear that Romney or whoever wrote this piece doesn't actually understand what culture even is.
His eyes looked sunken thus closed, in the sidelight from the carriage-window.Shadows of Flames|Amelie Rives
Except as a sidelight on the character of the early Greek trader the story is worthless.The Religion of Numa|Jesse Benedict Carter
He glanced through the sidelight of the front door, carelessly.The Moonlit Way|Robert W. Chambers
The medical opinions of Cato throw a sidelight upon the state of medicine in his time.Outlines of Greek and Roman Medicine|James Sands Elliott
"I see," said Bob, vastly amused at this sidelight on the family reputation.The Rules of the Game|Stewart Edward White