The most common and most likely answer to this crossword clue is the 5 letter word ANGLE
I've seen this crossword clue in The Daily Telegraph
A
N
G
L
E
More clues leading to the result ANGLE
Buddy explains!

The straight part
We know that "Early invader/point of view" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case early invader/point of view = angle.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 ANGLE mean?
ANGLE noun- A figure formed by two rays which start from a common point (a plane angle) or by three planes that intersect (a solid angle).
- The measure of such a figure. In the case of a plane angle, this is the ratio (or proportional to the ratio) of the arc length to the radius of a section of a circle cut by the two rays, centered at their common point. In the case of a solid angle, this is the ratio of the surface area to the square of the radius of the section of a sphere.
- A corner where two walls intersect.
- A change in direction.
- A viewpoint; a way of looking at something.
- The focus of a news story.
- Any of various hesperiid butterflies.
- A storyline between two wrestlers, providing the background for and approach to a feud.
- An ulterior motive; a scheme or means of benefitting from a situation, usually hidden, often immoral
- A projecting or sharp corner; an angular fragment.
- Any of the four cardinal points of an astrological chart: the Ascendant, the Midheaven, the Descendant and the Imum Coeli.
- (often in the passive) To place (something) at an angle.
- To change direction rapidly.
- To present or argue something in a particular way or from a particular viewpoint.
- (cue sports) To hamper (oneself or one's opponent) by leaving the cue ball in the jaws of a pocket such that the surround of the pocket (the "angle") blocks the path from cue ball to object ball.
- A fishhook; tackle for catching fish, consisting of a line, hook, and bait, with or without a rod.
- To try to catch fish with a hook and line.
- (with for) To attempt to subtly persuade someone to offer a desired thing.