FACE or "All cows eat grass” as used in musical education, for example (8)

I believe the answer is:

mnemonic

(Other definitions for mnemonic that I've seen before include "jogger" , "Device to aid memory recall" , "System for improving memory" , "Verse or other aid to help one remember facts" , "Aide-memoire" .)

I've seen this clue in The Times.

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