Anticipate toll-free deviation (8)
I believe the answer is:
foretell
'anticipate' is the definition.
(synonyms)
'toll-free deviation' is the wordplay.
'deviation' indicates an anagram.
'toll'+'free'='tollfree'
'tollfree' anagrammed gives 'FORETELL'.
(Other definitions for foretell that I've seen before include "Foreshadow or presage" , "Prognosticate" , "'Predict, prophesy (8)'" , "Divine" , "supporting English archer" .)