### Clue: One shifted in a locomotive, transported only for a short time (9)
### Answer: TRANSIENT 
 ### Explanation: Definition: only for a short time
 [ TRAIN(not a locomotive, but a series of carriages pushed or pulled by a self-propelled locomotive) + SENT(transported away) ] **with** "I"(Roman numeral for "one") **moved down**(shifted, in a down clue).