Turner's run out to top of road (5)
I believe the answer is:
rotor
'turner's' is the definition.
(something that turns)
'run out to top of road' is the wordplay.
'run out' becomes 'ro' (cricket abbreviation).
'top of' indicates taking the first letters.
The initial letter of 'road' is 'r'.
'ro'+'to'+'r'='ROTOR'
(Other definitions for rotor that I've seen before include "Flywheel" , "part of chopper" , "Palindromic moving part" , "Hub with radiating blades" , "US state South of L. Erie" .)