This might hide Hera's error! (6)

I believe the answer is:

eraser

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'this might' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'hide hera's error' is the wordplay.
'hide' says the answer is hidden in the clue.
'ERASER' can be found hidden inside 'heras error'.

Can you help me to learn more?

(Other definitions for eraser that I've seen before include "An Indian rubber" , "destroyer" , "Rubs out" , "(Pencil, ink) rubber" , "A schoolboy's rubber" .)

I've seen this clue in The Irish Times.

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