Crossword Genius

A growing reason for my backwardness in an article (5)

Ross

I believe the answer is:

thyme

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'article' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for thyme that I've seen before include "Seasoning plant" , "Aromatic ingredient" , "Ingredient in cooking" , "Plant of the mint family" , "something fragrant?" .)

I've seen this clue in the Evening Standard.
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