Crossword Genius

Beginner's mistake, trading bits of public relations (4)


I believe the answer is:


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'beginner's' is the definition.

'mistake trading bits of public relations' is the wordplay.
I cannot really see how this works, but
'of' could be 'o' and 'o' is found in the answer.
The remaining letters 'tyr' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for tyro that I've seen before include "Apprentice" , "Neophyte" , "Spell for rookie" , "Initiate" , "New" .)

I've seen this clue in The Telegraph.
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