Crossword Genius

One over the limit cabby makes take a shot? (5,6)

Ross

I believe the answer is:

speed camera

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

'shot?' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'one over the limit cabby makes take a' is the wordplay.
I cannot really understand how this works, but
'one' could be 'me' (a setter might use 'one' to humourously mean 'me') and 'me' is located in the answer.
'take' could be 'r' (abbreviation for 'recipe', Latin for 'take') and 'r' is found in the answer.
'a' is within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for speed camera that I've seen before include "Roadside picture taker" , "Roadside detector" , "Roadside snapper" , "Roadside trap" , "What might capture" .)

I've seen this clue in The Times and The Sunday Times.
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