Predict toll-free trips (8)
I believe the answer is:
foretell
'predict' is the definition.
(I know that predict can be written as foretell)
'toll-free trips' is the wordplay.
'trips' is an anagram indicator.
'toll'+'free'='tollfree'
'tollfree' with letters rearranged gives 'FORETELL'.
(Other definitions for foretell that I've seen before include "Foreshadow or presage" , "'Predict, prophesy (8)'" , "Divine" , "Herald" , "supporting English archer" .)