Horrible tartan sometimes used by furniture-maker (6)
I believe the answer is:
rattan
'furniture-maker' is the definition.
(I've seen this before)
'horrible tartan sometimes used' is the wordplay.
'tartan' anagrams to 'RATTAN'.
Though, I'm unsure how the anagram is indicated.
'by' is the link.
Can you help me to learn more?
(Other definitions for rattan that I've seen before include "Climbing palm; cane" , "Stem of climbing palm used in wickerwork" , "Type of cane for chairs" , "Pliable palm stems used in weaving" , "Kind of cane used in furniture" .)