Telephone teacher - he's employed in the circus (10)

I believe the answer is:

ringmaster

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'he's employed in the circus' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'telephone teacher' is the wordplay.
'telephone' becomes 'ring' (synonyms).
'teacher' becomes 'master' (I've seen this before).
'ring'+'master'='RINGMASTER'

Can you help me to learn more?

(Other definitions for ringmaster that I've seen before include "Circus controller" , "Circus leader" , "circus performer" , "Circus employee" , "Top top man" .)

I've seen this clue in The Irish News.

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