Crossword Genius

Three Rs so revitalised after the writer’s backing copies (7)

Ross

I believe the answer is:

mirrors

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'copies' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps you can see an association between them that I don't see?

'three rs so revitalised after the writer's backing' is the wordplay.
'three rs' means three replacements for 'r'.
'revitalised' is an anagram indicator.
'after' means one lot of letters go next to another.
'the writer's' becomes 'I'm' ('I am' referring to the writer of the clue).
'backing' shows that the letters should be reversed in order.
'im' backwards is 'mi'.
'r'+'so'='rso'
'rso' anagrammed gives 'ors'.
'r'+'r'+'ors'='rrors'
'rrors' put after 'mi' is 'MIRRORS'.

Can you help me to learn more?

(Other definitions for mirrors that I've seen before include "Shows a reflection" , "Reflective pieces of glass" , "Reflects" , "Reflections" .)

I've seen this clue in The Independent.
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