Brush-making plant? (5)
I believe the answer is:
shrub
'plant?' is the definition.
(type of plant)
'brush-making' is the wordplay.
'making' indicates an anagram.
'brush' anagrammed gives 'SHRUB'.
(Other definitions for shrub that I've seen before include "Bushy plant" , "Perhaps Heather" , "Woody plant, bush" , "Small woody tree" , "Rose, perhaps" .)