Farm vehicle having rubbish to carry about (7)
I believe the answer is:
tractor
'farm vehicle' is the definition.
(I've seen this before)
'rubbish to carry about' is the wordplay.
'rubbish' becomes 'rot' (I've seen this before).
'to carry' becomes 'cart' (carting is a kind of carrying).
'about' shows that the letters should be reversed in order.
'rot'+'cart'='rotcart'
'rotcart' in reverse letter order is 'TRACTOR'.
'having' is the link.
(Other definitions for tractor that I've seen before include "Agricultural vehicle" , "Type of truck with a a cab but no body" , "Agricultural machine" , "Powerful farm vehicle for heavy work" , "Tower" .)