Crossword Genius

Town crier's profession? (7)

Ross

I believe the answer is:

calling

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'town crier's' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'profession?' is the second definition.
(I've seen this in other clues)

Can you help me to learn more?

(Other definitions for calling that I've seen before include "Predicting the outcome" , "visiting" , "Vocation or profession" , "Urge to follow a particular career" , "Occupation" .)

I've seen this clue in The Globe and Mail.
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