Candle component
I believe the answer is:
'candle component' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for wick that I've seen before include "Highland town" , "Candle's thread" , "one adding fuel to flame" , "Candle cord - Scottish town" , "Caithness fishing town - part of candle" .)