Teacher, nurse, or typist, perhaps (3,6)

'teacher nurse' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'typist perhaps' is the wordplay.
I cannot really see how this works, but
'typist perhaps' could be 'worker' (typist is a kind of worker) and 'worker' is found within the answer.
The remaining letters 'key' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'or' acts as a link.

Can you help me to learn more?