Right over hill, finding revolver (5)
I believe the answer is:
rotor
'revolver' is the definition.
(something which revolves)
'right over hill' is the wordplay.
'right' becomes 'r' (common abbreviation).
'over' becomes 'o' (cricket abbreviation).
'hill' becomes 'tor' (tor is a kind of hill).
'r'+'o'+'tor'='ROTOR'
'finding' is the link.
(Other definitions for rotor that I've seen before include "Revolver" , "Device to propel a helicopter" , "Palindromic moving part" , "Hub with radiating blades" , "Eddy" .)