A cart turning to the right and it's very slow-moving (7)

I believe the answer is:

tractor

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'it's very slow-moving' is the definition.
I can't judge whether this defines the answer.

'a cart turning to the right' is the wordplay.
'turning' says the letters should be written backwards.
'the right' becomes 'r' (abbreviation).
'cart' in reverse letter order is 'trac'.
'trac'+'to'+'r'='TRACTOR'

'and' acts as a link.

Can you help me to learn more?

(Other definitions for tractor that I've seen before include "Bombardier possibly" , "I can draw" , "Vehicle used on farms" , "Agricultural vehicle" , "Powerful farm vehicle for heavy work" .)

I've seen this clue in the Evening Standard.

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