Carry up some tracks (4)

I believe the answer is:

cart

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'carry' is the definition.
(I know that cart is a kind of carry)

'up some tracks' is the wordplay.
'up' becomes 'car' (I am not sure about this - if you are sure you should believe this answer much more).
'some' indicates taking the first letters.
The first letter of 'tracks' is 't'.
'car'+'t'='CART'

Can you help me to learn more?

(Other definitions for cart that I've seen before include "Wheelbarrow" , "Primitive transport" , "Something not to be put in front of the horse" , "Open vehicle" , "Heavy open wagon" .)

I've seen this clue in the Evening Standard.

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