Necklace found in motor club (4)
I believe the answer is:
torc
'necklace' is the definition.
(medieval neck ornament)
'in motor club' is the wordplay.
'in' indicates a hidden word.
'TORC' is hidden within 'motor club'.
'found' acts as a link.
(Other definitions for torc that I've seen before include "Metallic neck ornament" , "ancient necklace" , "One gets into a twist" , "Metal armband worn by Ancient Britons" , "Choker" .)