PR spokesperson bites back when confronted by medical expert (4,6)

I believe the answer is:

spin doctor

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'pr spokesperson' is the definition.
'spin doctor' can be an answer for 'spokesperson' (spin doctor is a kind of spokesperson). I'm unsure of the 'pr' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for spin doctor that I've seen before include "Public relations expert" , "spokesperson" , "Supposed PR expert" , "Massager of news etc" , "Government communicator" .)

I've seen this clue in The Irish Times.

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