Crossword Genius

Perfect boy saving sum of money (4,2)

Ross

I believe the answer is:

spot on

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'perfect' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for spot on that I've seen before include "Exactly right" , "Excellent" , "what soiled garment had?" , "Precisely what's required" , "Precise" .)

I've seen this clue in The Telegraph.
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