User votes to reveal short gas seller (5)

I believe the answer is:

servo

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'short gas seller' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'user votes to reveal' is the wordplay.
'to reveal' indicates a hidden word.
'SERVO' is hidden in the letters of 'user votes'.

Can you help me to learn more?

(Other definitions for servo that I've seen before include "Control motor" , "Control system" , "Device amplifying forces" , "Power-enhancing mechanism" , "Assisting motor" .)

I've seen this clue in the Sydney Morning Herald.

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