Cropped up; stood up (6)
I believe the answer is:
arisen
This clue is a double definition.
'cropped up' is the first definition.
(I've seen this in another clue)
'stood up' is the second definition.
('arise' can be a synonym of 'stand up')
(Other definitions for arisen that I've seen before include "Up on the rocks" , "It's appeared" , "Come to light" , "Sprung up" , "(Has) come into view; (has) originated (from)" .)