Musician's electronic music in your old treatment that's not exclusive (5,7)
I believe the answer is:
group therapy
'not exclusive' is the definition.
The definition suggests a singular noun which matches the answer.
'musician's electronic music in your old treatment' is the wordplay.
I cannot quite see how this works, but
'electronic' could be 'e' (as in e-mail or e-books) and 'e' is present in the answer.
'music' could be 'rap' (I've seen this before) and 'rap' is found within the answer.
'your' could be 'thy' (I've seen this before) and 'thy' is located in the leftover letters.
'old' could be 'o' (common abbreviation eg in OE for Old English) and 'o' is found in the answer.
This explanation may well be incorrect...
'that's' is the link.
Can you help me to learn more?
(Other definitions for group therapy that I've seen before include "Psychological treatment via social interaction" , "rehab class" , "Analysis for several people together" .)