This installed, point at vehicle sent the wrong way? (6)
I believe the answer is:
satnav
'this installed' is the definition.
I know nothing about this answer so I can't judge whether this works.
'point at vehicle sent the wrong way?' is the wordplay.
'point' becomes 'S' (S is an example).
'vehicle' becomes 'van' (van is a kind of vehicle).
'sent the wrong way?' is a reversal indicator.
'van' backwards is 'nav'.
's'+'at'+'nav'='SATNAV'
(Other definitions for satnav that I've seen before include "driving aid" , "Modern substitute for a map" , "Savant (anag)" , "Device for finding one's way" , "Routemaster perhaps" .)