### Clue: Silencer Mike put on Victorian pick-up (4)
### Answer: MUTE 
 ### Explanation: Definition: Silencer
 M(letter represented by "Mike" in the phonetic alphabet) **plus**( , in a down clue) + UTE(a term used in Australia, including its state of Victoria, for a utility vehicle;a pick-up truck).
Defn: A device for muting the sound from an instrument – though not much use if it totally silences.