Squares arranged costs to get farm vehicle (9)

'squares' is the definition.
(quadrate is a kind of square)

'arranged costs to get farm vehicle' is the wordplay.
I cannot really understand how this works, but
'costs' could be 'rates' (rate is a kind of cost) and 'rates' is found in the answer.
'vehicle' could be 'quad' (I have seen 'sporty vehicle' mean 'quad' so perhaps 'vehicle' could also mean 'quad') and 'quad' is found within the answer.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?