Obsession of individual recording soul (3-5,4)
I believe the answer is:
one-track mind
'obsession' is the definition.
(I've seen this before)
'individual recording soul' is the wordplay.
'individual' becomes 'one'.
'recording' becomes 'track' (I've seen this before).
'soul' becomes 'mind' (mind is a kind of soul**).
'one'+'track'+'mind'='ONE-TRACK MIND'
'of' is the link.
(Other definitions for one-track mind that I've seen before include "Obsessive attitude to a subject" , "A very limited thinker?" , "Brain preoccupied with a single subject" , "Very basic obsession?" , "Brain that's singularly obsessed" .)