It provides good tips for writers (7)

I believe the answer is:

iridium

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'it provides good tips for writers' is the definition.
The definition suggests a singular noun which matches the answer.

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(Other definitions for iridium that I've seen before include "Metallic element resistant to corrosion, atomic no. 77" , "Colourful compounds come from this" , "Hard metal element, Ir" , "Corrosion-resistant metal, Ir" , "Corrosion inhibitor" .)

I've seen this clue in The Globe and Mail.

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