Around one, it's going to tell you the meal is ready (4)
I believe the answer is:
gong
'tell you the meal is ready' is the definition.
I can't tell whether this definition defines the answer.
'around one it's going' is the wordplay.
'around' means one lot of letters goes inside another.
'one it's' becomes 'gg' (I am not sure about this - if you are sure you should believe this answer much more).
'going' becomes 'on' (both can mean functioning or activated).
'gg' placed around 'on' is 'GONG'.
'to' is the link.
Can you help me to learn more?
(Other definitions for gong that I've seen before include "Dinner call - medal" , "Sound announcing meal" , "Round metal plate struck to resound" , "Dinner chime or slangy medal" , "Medal; forty down" .)