Hector's switched lights (7)
I believe the answer is:
torches
'lights' is the definition.
(torch is a kind of light)
'hector's switched' is the wordplay.
'switched' indicates an anagram (letters switch places).
'hectors' with letters rearranged gives 'TORCHES'.
(Other definitions for torches that I've seen before include "Fires" , "Sets on fire" , "Hand-held lights" , "Portable lights or lamps" , "Sets alight" .)