Dice game inappropriate? Scarper! (6,3)
I believe the answer is:
beetle off
'scarper' is the definition.
(both can mean to hurry away)
'dice game inappropriate?' is the wordplay.
'dice game' becomes 'beetle' (game played with dice).
'inappropriate?' becomes 'off' (I am not sure about this - if you are sure you should believe this answer much more).
'beetle'+'off'='BEETLE OFF'
Can you help me to learn more?
(Other definitions for beetle off that I've seen before include "Scuttle" , "Scurry away" .)