Crossword Genius

One who exploits us with a half of beer (4)

Ross

I believe the answer is:

user

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'one who exploits' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'us with a half of beer' is the wordplay.
'with' means one lot of letters go next to another.
'a half of' means to take half the letters.
'beer' halved is 'er'.
'us'+'er'='USER'

Can you help me to learn more?

(Other definitions for user that I've seen before include "Manipulator" , "One taking drugs" , "Ruse for employer" , "One who works an appliance" , "Druggie" .)

I've seen this clue in the Evening Standard.
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