Supporter of light murder weapon (11)
I believe the answer is:
candlestick
'murder weapon' is the definition.
(I've seen this before)
'supporter of light' is the wordplay.
I cannot really understand how this works, but
'light' could be 'candle' (candle is a kind of light) and 'candle' is found in the answer.
The remaining letters 'stick' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for candlestick that I've seen before include "Lights" , "on-board weapon" , "Holder for waxy illuminator" , "Portable light holder" , "Jesse" .)