Revolver English brought into factory (6)
I believe the answer is:
planet
'revolver' is the definition.
(a planet is a thing that 'revolves')
'english brought into factory' is the wordplay.
'english' becomes 'E' (abbreviation).
'brought into' is an insertion indicator.
'factory' becomes 'plant' (a manufacturing plant).
'e' placed into 'plant' is 'PLANET'.
(Other definitions for planet that I've seen before include "One orbiting star" , "Neptune, for example" , "Earth, for example" , "Eg, Mars or Pluto" , "Celestial body that revolves around the sun" .)