Get lost in Hits from Christmas (5)
I believe the answer is:
scram
'get lost' is the definition.
(interjections with similar meaning)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for scram that I've seen before include "Go away quickly" , "Skedaddle!" , "Scarper" , "Make oneself scarce" , "Shoo!" .)