Piece of timber usable as a brace (5)
I believe the answer is:
'piece' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'timber usable as a brace' is the wordplay.
'brace' anagrams to 'CABER'.
But, I'm unsure how this is indicated.
'of' is the link.
Can you help me to learn more?
(Other definitions for caber that I've seen before include "Brace (anag) - pole" , "Tree trunk tossed in sport" , "Trunk tossed in the Highlands" , "One taking a toss" , "Pole hurled in Highland Games" .)