Believer in growth industries, partly (5)
I believe the answer is:
hindu
'believer' is the definition.
(believer in Hinduism)
'in growth industries partly' is the wordplay.
'partly' indicates a hidden word (part of the clue is used).
'HINDU' is hidden in the letters of 'in growth industries'.
(Other definitions for hindu that I've seen before include "Religious believer" , "Follower of a major religion of the Indian subcontinent" , "Native of India" , "Devotee of Indian religion" , "Most of the Indians are" .)