A rambler came up (5)
I believe the answer is:
arose
'came up' is the definition.
(I've seen this before)
'a rambler' is the wordplay.
'rambler' becomes 'rose' (I've seen this in another clue).
'a'+'rose'='AROSE'
(Other definitions for arose that I've seen before include "Got out of bed" , "Occurred; stood up" , "Cropped up" , "Originated (from)" , "Followed" .)