(~s)
1.
If you have a ~, you have a strong feeling that you are especially suited to do a particular job or to fulfil a particular role in life, especially one which involves helping other people.
It could well be that he has a real ~...
Diana was a young mission school teacher convinced of her ~ to provide support for her schoolgirl pupils.
N-VAR
2.
If you refer to your job or profession as your ~, you feel that you are particularly suited to it.
Her ~ is her work as an actress...
N-VAR: oft poss N