Candle-holder attached to a wall (6)
I believe the answer is:
sconce
'candle-holder attached to a wall' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sconce that I've seen before include "Wall-mounted candle holder" , "Ornamental candle holder" , "Candlestick holder" , "Wall bracket, for candles say" , "Crown" .)