Minister finally backing move in campaign for development (8)
I believe the answer is:
progress
'development' is the definition.
(progress is a kind of development)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for progress that I've seen before include "Gradual improvement or development" , "Satisfactory development" , "Move forward" , "Forward movement towards a destination or goal" , "Headway" .)