Crossword Genius

Being transient, it starts fading (3)

Ross

I believe the answer is:

fad

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'being transient' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'it starts fading' is the second definition.
The definition suggests a singular noun which matches the answer.

Can you help me to learn more?

(Other definitions for fad that I've seen before include "A craze or current vogue" , "A passing fashion or craze" , "Craze; idiosyncrasy" , "transient success" , "A passing liking or fashion" .)

I've seen this clue in the Evening Standard.
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