Travelled behind or ensued (8)
I believe the answer is:
followed
This clue is a double definition.
'travelled behind' is the first definition.
('follow' can be a synonym of 'travel behind')
'ensued' is the second definition.
(following is a kind of ensuing)
(Other definitions for followed that I've seen before include "Travelled behind or ensued" , "Came along behind" , "Pursued" .)