It's pointedly involved in the tracking of certain records (6)

I believe the answer is:

stylus

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'of certain records' is the definition.
The definition suggests a singular noun which matches the answer.

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

Can you help me to learn more?

(Other definitions for stylus that I've seen before include "writer" , "Engraving instrument" , "Old gramophone needle" , "Ancient writing implement" , "Old writing implement" .)

I've seen this clue in the Evening Standard.

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