Poser voted to reveal careless gas station (5)

I believe the answer is:

servo

I'm a little stuck... Click here to teach me more about this clue!

'gas station' is the definition.
(I know that gas station can be written as servo)

'poser voted to reveal' is the wordplay.
'to reveal' indicates a hidden word.
'SERVO' can be found hidden inside 'poser voted'.

'careless' is the link.
I am not very happy about this link. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for servo that I've seen before include "car mechanism" , "Power-enhancing mechanism" , "Powered mechanism that amplifies force" , "Powered control mechanism" , "Power mechanism" .)

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

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