Helicopter part found on Kilimanjaro, torched (5)
I believe the answer is:
rotor
'helicopter part' is the definition.
('rotor' is part of 'helicopter')
'found on kilimanjaro torched' is the wordplay.
'found' indicates a hidden word.
'ROTOR' can be found hidden inside 'on kilimanjaro torched'.
(Other definitions for rotor that I've seen before include "Turning component" , "Reversible piece of moving machinery?" , "Turning motor part" , "Spinner" , "The machine part moves in a circle" .)