Pole leaving Egypt on a journey to safety (6,3)
I believe the answer is:
aarons rod
'journey to safety' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'pole leaving egypt on a' is the wordplay.
I cannot really see how this works, but
'pole' could be 'rod' ('rod' can be a synonym of 'pole') and 'rod' is found in the answer.
'on' is within the answer.
'a' is found in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for aarons rod that I've seen before include "Plant" , "book" , "produced almonds" , "Lawrence's work" , "Adorn Rosa with flower named after biblical staff" .)