The most common and most likely answer to this crossword clue is the 5 letter word FADES
I've seen this crossword clue in The Times
F
A
D
E
S
More clues leading to the result FADES
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The straight part
We know that "Gets less" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case gets less = fades.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 FADES mean?
FADES noun- A golf shot that (for the right-handed player) curves intentionally to the right. See slice, hook, draw.
- A haircut where the hair is short or shaved on the sides of the head and longer on top. See also high-top fade and low fade.
- A fight.
- A gradual decrease in the brightness of a shot or the volume of sound or music (as a means of cutting to a new scene or starting a new song).
- The act of disappearing from a place so as not to be found; covert departure.
- To grow weak; to lose strength; to decay; to perish gradually; to wither, as a plant.
- To lose freshness, color, or brightness; to become faint in hue or tint; hence, to be wanting in color.
- To sink away; to disappear gradually; to grow dim; to vanish.
- To cause to fade.
- To bet against.