Consider likely to happen (6)
I believe the answer is:
expect
'consider likely to happen' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for expect that I've seen before include "Regard (someone) as likely to arrive" , "Consider likely to happen" , "Suppose, assume" , "Be waiting for" , "Anticipate - rely upon - suppose" .)