Crossword Genius

Someone who carefully reads how a service may be charged (7)

Ross

I believe the answer is:

peruser

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'someone who carefully reads' is the definition.
The definition suggests a singular noun which matches the answer.

'a service may be charged' is the wordplay.
'a' becomes 'per' (eg 'one a day' means 'one per day').
'service may' becomes 'ruse' (I can't justify this - if you can you should give a lot more credence to this answer).
'be charged' indicates putting letters inside (charged can mean filled with).
'per' placed around 'ruse' is 'PERUSER'.

'how' acts as a link.

Can you help me to learn more?

(Other definitions for peruser that I've seen before include "A careful reader or browser" , "One examining" , "Scanner" , "one reads" , "Rep rues meeting a reader" .)

I've seen this clue in The Independent.
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