Therapist at gathering votes against admitting learner (7)
I believe the answer is:
analyst
'therapist' is the definition.
(I have seen 'Psychological therapist ' mean 'analyst' so perhaps 'therapist' could also mean 'analyst')
'at gathering votes against admitting learner' is the wordplay.
'gathering' is an insertion indicator (gather can mean to acquire or bring in).
'votes against' becomes 'nays' (as in ayes and nays).
'admitting' indicates putting letters inside (admit can mean to welcome in or accept).
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'nays' enclosing 'l' is 'nalys'.
'at' enclosing 'nalys' is 'ANALYST'.
(Other definitions for analyst that I've seen before include "Psychological therapist" , "Examiner - psychiatrist" , "one involved in breakdown" , "Expert who studies data and recommends appropriate action" , "He separates things, say systems, into component parts to study them" .)