In doctor-repellents, first person is relevant (7)
I believe the answer is:
applies
'is relevant' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for applies that I've seen before include "Implements" , "Is relevant" , "Makes use of" , "Fills in form for job" , "Makes a request" .)