Memory aid (8)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
mnemonic
'memory aid' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mnemonic that I've seen before include "Letters aiding memory" , "Verse etc to aid memory" , "Device for remembering things" , "Device to aid memory recall" , "It reminds us" .)