Lacking direction (7)
'lacking direction' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aimless that I've seen before include "Without purpose, like Melissa" , "Lacking a goal" , "Without purpose or direction" , "Drifting with no purpose" , "Without direction or ambition" .)
(Other definitions for lost that I've seen before include "Mislaid or was defeated" , "See 10" , "TV series!" , "Not knowing one's whereabouts" , "Mogul empire official; rich person" .)