Two queens drink when one blanks out (6)

I believe the answer is:

eraser

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'one blanks out' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'two queens drink when' is the wordplay.
'two queens' can mean two substitutions for 'queen'.
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'drink' indicates putting letters inside.
'when' becomes 'as'.
'er'+'er'='erer'
'erer' going around 'as' is 'ERASER'.

Can you help me to learn more?

(Other definitions for eraser that I've seen before include "Rubber for removing marks" , "Rubbing-out device" , "(Pencil, ink) rubber" , "An Indian rubber" , "One who removed" .)

I've seen this clue in The Hindu.

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