Metal necklace not entirely light (4)
I believe the answer is:
torc
'metal necklace' is the definition.
'torc' can be an answer for 'necklace' (medieval neck ornament). I'm not certain of the 'metal' bit.
'not entirely light' is the wordplay.
'not entirely' means to remove the last letter (most but not all of the word).
'light' becomes 'torch' (type of light).
'torch' with its final letter removed is 'TORC'.
Can you help me to learn more?
(Other definitions for torc that I've seen before include "Twisted metal neck band" , "ancient necklace" , "Rigid circular necklace" , "Metallic neck ornament" , "One gets into a twist" .)