Wood used in model-making (3)
I believe the answer is:
elm
'wood' is the definition.
(elm is a kind of wood)
'in model-making' is the wordplay.
'in' says the answer is hidden in the clue.
'ELM' is hidden within 'model making'.
'used' acts as a link.
(Other definitions for elm that I've seen before include "Native British tree" , "Timber tree" , "Tree with a Dutch disease" , "Forest tree" , "Furniture wood" .)