Long Tube journey in minute (5,5)
I believe the answer is:
strip light
'long tube' is the definition.
(tubular light)
'journey in minute' is the wordplay.
'journey' becomes 'trip' (trip is a kind of journey).
'in' is an insertion indicator.
'minute' becomes 'slight' (minute can mean small).
'trip' going into 'slight' is 'STRIP LIGHT'.
(Other definitions for strip light that I've seen before include "source of illumination" , "tube for the office" .)