Briefly showing the money one gets for a quantity of gas (3-6)

I believe the answer is:

air-intake

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'for a quantity of gas' is the definition.
I can't judge whether this definition defines the answer.

'briefly showing the money one' is the wordplay.
'briefly' means to remove the last letter.
'showing' becomes 'airing' (both can mean broadcasting).
'the money one' becomes 'take' (I can't explain this - if you can you should believe this answer much more).
'airing' with its last letter taken off is 'airin'.
'airin'+'take'='AIR-INTAKE'

'gets' acts as a link.

Can you help me to learn more?

(Other definitions for air-intake that I've seen before include "Engine valve" , "part of carburettor" .)

I've seen this clue in The Times.

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