Beginner's mistake, trading bits of public relations (4)
I believe the answer is:
'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" .)