Voices concerns about candlestick (6)
I believe the answer is:
sconce
'candlestick' is the definition.
(sconce is a kind of candlestick)
'voices concerns about' is the wordplay.
'about' says the answer is hidden in the clue.
'SCONCE' is hidden within 'voices concerns'.
(Other definitions for sconce that I've seen before include "wit at one time" , "fine at university" , "Candle-holder attached to a wall" , "Wall bracket for a candle" , "Wall bracket, for candles say" .)