Cast in Ben-Hur, legendary (4)
I believe the answer is:
hurl
'cast in ben' is the definition.
'hurl' can be an answer for 'cast' (synonyms). I am not sure about the 'in ben' bit.
'hur legendary' is the wordplay.
'legendary' becomes 'l' (this might be a standard abbreviation of which I'm unaware).
'hur'+'l'='HURL'
Can you help me to learn more?
(Other definitions for hurl that I've seen before include "Throw forcefully" , "Launch" , "Throw forcibly" , "Throw violently" , "Throw with force" .)