Crossword Genius

'Top speed. Satisfied ...?' met with silence (4,8)

Ross

I believe the answer is:

full throttle

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

'top speed' is the definition.

'satisfied ? met with silence' is the wordplay.
I cannot really see how this works, but
'satisfied' could be 'full' (e.g. after eating) and 'full' is found within the answer.
The remaining letters 'throttle' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.
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