Develop gun taken out of its sheath (6)
I believe the answer is:
evolve
'develop' is the definition.
(I know that develop can be written as evolve)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for evolve that I've seen before include "Unfold" , "Gradually acquire new characteristics" , "Undergo development or evolution" , "Develop or change very gradually (6)" , "Unravel" .)