He may get told to stick 'em up! (10)
I believe the answer is:
billposter
'he may get told to stick 'em up' is the definition.
The definition suggests a singular noun which matches the answer.
'he may' is the wordplay.
'he' becomes 'bill' (short for William).
'may' becomes 'poster' (I can't explain this - if you can you should believe this answer much more).
'bill'+'poster'='BILLPOSTER'
Can you help me to learn more?
(Other definitions for billposter that I've seen before include "One who pastes up adverts on hoardings" , "One pasting up advertisements" , "One who sticks at his job" .)