Calling to rush? (6)
I believe the answer is:
career
I believe this clue is a double definition.
'calling' is the first definition.
(synonyms)
'rush?' is the second definition.
(career can mean to run or move out of control)
'to' acts as a link.
(Other definitions for career that I've seen before include "One's professional life" , "One's business path through life" , "Hurtle" , "Go at top speed through a working life?" , "Rush wildly" .)