Motor held by men I brutalised on the way back (7)
I believe the answer is:
turbine
'motor' is the definition.
(turbine is a kind of motor)
'held by men i brutalised on the way back' is the wordplay.
'held by' indicates a hidden word.
'on the way back' says the letters should be written in reverse.
'enibrut' can be found hidden inside 'men i brutalised'.
'enibrut' back-to-front is 'TURBINE'.
(Other definitions for turbine that I've seen before include "Power generator" , "Power-producing machine" , "Machine driven by wheel turned by flow of water or gas" , "Fluid-driven motor" , "Rotary energy converter" .)