Something burning up oxygen in measuring device (6)
I believe the answer is:
meteor
'something burning up' is the definition.
(something burning up through the atmosphere)
'oxygen in measuring device' is the wordplay.
'oxygen' becomes 'O' (atomic symbol for oxygen).
'in' indicates putting letters inside.
'measuring device' becomes 'meter' (device for measuring something, eg a thermometer).
'o' inserted inside 'meter' is 'METEOR'.
(Other definitions for meteor that I've seen before include "Remote (anag)" , "Small piece of matter in the solar system" , "Remote type of heavenly body" , "Shooting star" , "Remote sort of heavenly body" .)