Back copies valued in isolation (9)

I believe the answer is:

separated

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'back copies valued in isolation' is the definition.
I can't tell whether this defines the answer.

'back copies valued' is the wordplay.
'back' says the letters should be written in reverse.
'copies' becomes 'apes' ('ape' can be a synonym of 'copy').
'valued' becomes 'rated' (rating is a kind of valuing).
'apes' in reverse letter order is 'sepa'.
'sepa'+'rated'='SEPARATED'

Can you help me to learn more?

(Other definitions for separated that I've seen before include "Distinguished -- divided" , "Split" , "No longer connected or joined" , "in different cages?" , "Broke up" .)

I've seen this clue in The Daily Express.

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