Please entertain us when administering medicine! (6)
I believe the answer is:
dosing
'administering medicine' is the definition.
I can't tell whether this definition defines the answer.
'please entertain us' is the wordplay.
'please' becomes 'do' (I've seen this in other clues).
'entertain us' becomes 'sing' (I can't explain this - if you can you should believe this answer much more).
'do'+'sing'='DOSING'
'when' is the link.
Can you help me to learn more?
(Other definitions for dosing that I've seen before include "Dispensing" , "Giving medicine" .)