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Andromeda’s associate peruses the revision (7)

Ross

I believe the answer is:

perseus

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'andromeda's associate' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'peruses the revision' is the wordplay.
'the revision' indicates an anagram.
'peruses' anagrammed gives 'PERSEUS'.

Can you help me to learn more?

(Other definitions for perseus that I've seen before include "legendary hero" , "'Having slain Medusa, he became a constellation (7)'" , "Mythical hero" , "Gorgon-slayer and rescuer of Andromeda" , "Greek hero who rescued Andromeda" .)

I've seen this clue in the Evening Standard.
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