All right to be carried by the man on lorry leaving plant (9)
I believe the answer is:
artichoke
'plant' is the definition.
(artichoke is a kind of plant)
'all right to be carried by the man on lorry' is the subsidiary indication.
'all right' becomes 'ok' ('ok' can be a synonym of 'all right').
'to be carried by' means one lot of letters goes inside another.
'the man' becomes 'he' (**).
'on' is a charade indicator (letters next to each other).
'lorry' becomes 'artic' (articulated lorry is a semi-trailer truck).
'ok' inserted into 'he' is 'hoke'.
'hoke' put after 'artic' is 'artichoke'.
'leaving' is the link.
(Other definitions for artichoke that I've seen before include "something often associated with Jerusalem" , "Vegetable could give you a thicko ear" , "Plant with large edible flower-head" , "Thistle-like plant with edible heads" , "Globe vegetable?" .)