Believer in British industry (5)
I believe the answer is:
hindu
'believer' is the definition.
(believer in Hinduism)
'in british industry' is the wordplay.
'in' indicates a hidden word.
'HINDU' is hidden within 'british industry'.
(Other definitions for hindu that I've seen before include "Indian religious adherent" , "Man of religion" , "Follower of a major religion of the Indian subcontinent" , "Adherent of Indian religion" , "Believer in an Indian religion" .)