Timber used in wheel making (3)
I believe the answer is:
elm
'timber' is the definition.
(I've seen this before)
'in wheel making' is the wordplay.
'in' indicates a hidden word.
'ELM' is hidden within 'wheel making'.
'used' acts as a link.
(Other definitions for elm that I've seen before include "Source of timber" , "Tree with a Dutch disease" , "Deciduous tree with rough serrated leaves" , "Mel's tree" , "Source of wood" .)