Crossword Genius

Indicates man's title is not applicable and describes type of vaccine to be used (4)

Ross

I believe the answer is:

mrna

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

'title is not applicable and describes type of vaccine to be used' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'indicates man's' is the wordplay.
I cannot really see how this works, but
'man' could be 'mr' (Mr is an example) and 'mr' is found in the answer.
The remaining letters 'na' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Irish Times.
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