Cab one ordered for guiding light (6)
I believe the answer is:
beacon
'guiding light' is the definition.
(I've seen this in another clue)
'cab one ordered' is the wordplay.
'ordered' is an anagram indicator.
'cab'+'one'='cabone'
'cabone' is an anagram of 'BEACON'.
'for' acts as a link.
(Other definitions for beacon that I've seen before include "Watch fire" , "Navigational guide" , "Warning, guiding, fire" , "Guilding light" , "Light on a height for navigation or warning" .)