Crossword Genius

She upsets us at closing time (3)

Ross

I believe the answer is:

sue

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'she' is the definition.

'upsets us at closing time' is the wordplay.
'upsets' is a reversal indicator.
'at' says to put letters next to each other.
'closing time' becomes 'e' (I can't justify this - if you can you should give a lot more credence to this answer).
'us' in reverse letter order is 'su'.
'su'+'e'='SUE'

Can you help me to learn more?

(Other definitions for sue that I've seen before include "The girl to take to court" , "Take proceedings against (a person)" , "Charge" , "Make a legal claim" , "Bring charges against - girl" .)

I've seen this clue in the Evening Standard.
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