The most common and most likely answer to this crossword clue is the 5 letter word SHEER
I've seen this crossword clue in The Daily Telegraph
S
H
E
E
R
More clues leading to the result SHEER
Buddy explains!

The straight part
We know that "Outright" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case outright = sheer.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 SHEER mean?
SHEER noun- A sheer curtain or fabric.
- Very thin or transparent.
- Pure in composition; unmixed; unadulterated.
- (by extension) Downright; complete; pure.
- Used to emphasize the amount or degree of something.
- Very steep; almost vertical or perpendicular.
- Clean; quite; at once.
- The curve of the main deck or gunwale from bow to stern.
- An abrupt swerve from the course of a ship.
- To swerve from a course.
- To shear.