On part of journey (3)
I believe the answer is:
leg
This clue is a double definition.
'on' is the first definition.
(cricket term, fielding positions)
'part of journey' is the second definition.
(leg can mean a stage of a journey)
(Other definitions for leg that I've seen before include "Member" , "Support; cricket side" , "part of course" , "Poultry portion" , "Limb; stage" .)