Circus owner mum's shown round (7)
I believe the answer is:
showman
'circus owner' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'mum's shown round' is the wordplay.
'mum' becomes 'ma' (ma can mean mother).
'round' indicates putting letters inside.
'ma' placed within 'shown' is 'SHOWMAN'.
Can you help me to learn more?
(Other definitions for showman that I've seen before include "Circus or fair manager" , "Person helping to present" , "Entertainer" , "Impresario" , "Circus proprietor" .)