Turned without resistance and developed (7)
I believe the answer is:
evolved
'developed' is the definition.
('evolve' can be a synonym of 'develop')
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for evolved that I've seen before include "Developed and changed very gradually" , "Underwent development" , "changed over time" , "Gradually developed as Darwin put it" , "Advanced" .)