The most common and most likely answer to this crossword clue is the 7 letter word VALENCE
I've seen this crossword clue in The Guardian
V
A
L
E
N
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More clues leading to the result VALENCE
Buddy explains!

The straight part
We know that "Fringe" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fringe = valence.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 VALENCE mean?
VALENCE noun- An extract; a preparation, now especially one effective against a certain number of strains of a pathogen.
- The combining capacity of an atom, radical or functional group determined by the number of electrons that it will lose, gain, or share when it combines with other atoms etc.
- The number of binding sites of a molecule, such as an antibody or antigen.
- The number of arguments that a verb can have, including its subject, ranging from zero (for the likes of "It rains") to three (for the likes of "He gives her a flower") or, less commonly, four.
- A one-dimensional value assigned to an object, situation, or state, that can usually be positive or negative.
- Value.
- A short curtain that usually hangs along the top edge of a window.
- A decorative framework used to conceal the curtain mechanism and so on at the top of a window.
- (bedding) A short, decorative edging of cloth that hangs from the mattress to the floor.
- The drooping edging of the lid of a trunk, which covers the joint when the lid is closed.