Turner is delayed about an hour (5)
I believe the answer is:
lathe
'turner' is the definition.
(a lathe is something which 'turns')
'delayed about an hour' is the wordplay.
'delayed' becomes 'late' (running late).
'about' indicates putting letters inside.
'an hour' becomes 'h' (abbreviation).
'late' going around 'h' is 'LATHE'.
'is' acts as a link.
(Other definitions for lathe that I've seen before include "Turning device" , "Rotating machine tool" , "Machine for turning and shaping wood etc" , "craftsman's machine" , "Turning instrument" .)