Crossword Genius

One who operates within the house rules (4)

Ross

I believe the answer is:

user

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

'within the house rules' is the wordplay.
'within' indicates a hidden word.
'USER' is hidden within 'the house rules'.

Can you help me to learn more?

(Other definitions for user that I've seen before include "Someone who exploits another" , "Substance taker" , "One operating something" , "Consumer" , "Drug-taker" .)

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