One gets many a ring, no doubt (11)
I believe the answer is:
telephonist
'doubt' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'one gets many a ring no' is the wordplay.
I cannot quite see how this works, but
'one' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
'gets' could be 'is' (I've seen this in other clues) and 'is' is found within the answer.
'many' could be 'l' and 'l' is present in the answer.
'no' could be 'n' (common abbreviation) and 'n' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for telephonist that I've seen is " Switchboard operator".)