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Lower rating given to a quilt material supplier? (9)

Ross

I believe the answer is:

downgrade

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'quilt material supplier?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'lower rating given' is the wordplay.
'lower' becomes 'down' (synonyms).
'rating' becomes 'grade' (grade is a kind of rating).
'given' is a charade indicator (letters next to each other).
'down'+'grade'='DOWNGRADE'

'to a' acts as a link.

Can you help me to learn more?

(Other definitions for downgrade that I've seen before include "Sell short" , "Relegate" , "Demote" , "Reduce in rank or value" , "Denigrate" .)

I've seen this clue in The Guardian.
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