Crossword Genius

Girl sat behind Charlie in form (5)

Ross

I believe the answer is:

class

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'form' is the definition.
(I know that form can be written as class)

'girl sat behind charlie' is the wordplay.
'girl sat' becomes 'cl' (I can't justify this - if you can you should believe this answer much more).
'behind' means one lot of letters go next to another.
'charlie' becomes 'ass' (both can mean a foolish person).
'cl'+'ass'='CLASS'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for class that I've seen before include "Stylish; lesson" , "High-quality" , "Genus" , "Fine" , "sort" .)

I've seen this clue in The Telegraph.
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