Thanks for every candle (5)
I believe the answer is:
taper
'candle' is the definition.
(I know that taper is a type of candle)
'thanks for every' is the wordplay.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'for every' becomes 'per' ('per' means 'for each' or 'for every').
'ta'+'per'='TAPER'
(Other definitions for taper that I've seen before include "Narrow gradually as candle may" , "Get to the point" , "Get more narrow" , "Thin progressively" , "Tail off; a spill" .)