Turner oil at Hepworth shows (5)
I believe the answer is:
lathe
'turner' is the definition.
(a lathe is something which 'turns')
'oil at hepworth shows' is the wordplay.
'shows' says the answer is hidden in the clue.
'LATHE' can be found hidden inside 'oil at hepworth'.
(Other definitions for lathe that I've seen before include "Turner's machine" , "Means for turning" , "8 [TURNER]" , "Turning implement" , "Turning tool" .)