Evolves, grows (8)
I believe the answer is:
develops
This clue is a double definition.
'evolves' is the first definition.
('develop' can be a synonym of 'evolve')
'grows' is the second definition.
(developing is a kind of growing)
(Other definitions for develops that I've seen before include "Grows or formulates" , "'Evolves, grows (8)'" , "Grows, progresses" , "Spreads" , "Grows, increases or evolves" .)