Toby unwrapped hearing thing (9)
I believe the answer is:
obsession
'thing' is the definition.
(I've seen this before)
'toby unwrapped hearing' is the wordplay.
'unwrapped' says to take the centre (the letters which wrap the word are removed).
'hearing' becomes 'session' (I've seen this before).
The middle letters of 'toby' are 'ob'.
'ob'+'session'='OBSESSION'
(Other definitions for obsession that I've seen before include "Unhealthy compulsion" , "All-consuming idea" , "Continual preoccupation" , "Fan may display this" , "Fixed idea" .)