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Memory aid means not every memo or note is copied (8)

Ross

I believe the answer is:

mnemonic

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'memory aid' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

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(Other definitions for mnemonic that I've seen before include "Letters aiding memory" , "System for improving memory" , "Device (such as an acronym) used to aid recall" , "Verse or other aid to help one remember facts" , "Aid to remembering" .)

I've seen this clue in The Irish Times.
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