The most common and most likely answer to this crossword clue is the 3 letter word HUE
H
U
E
More clues leading to the result HUE
Buddy explains!

The straight part
We know that "Shade" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shade = hue.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.
What does HUE mean?
HUE noun- A color, or shade of color; tint; dye.
- The characteristic related to the light frequency that appears in the color, for instance red, yellow, green, cyan, blue or magenta.
- A character; aspect.
- Form; appearance; guise.
- A shout or cry.