Crossword Genius

Make firm decision to accelerate (3,4,4,4)

Ross

I believe the answer is:

put ones foot down

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

'accelerate' is the definition.
(I've seen this before)

'make firm decision' is the wordplay.
I cannot really see how this works, but
'make' could be 'puton' (putting on is a kind of making) and 'puton' is found within the answer.
This explanation may well be incorrect...

'to' acts as a link.

Can you help me to learn more?

(Other definitions for put ones foot down that I've seen before include "Insist" , "shift" , "Determined" , "Act firmly" , "gain momentum" .)

I've seen this clue in The Times.
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